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At WhatsApp we leverage FreeBSD and Erlang to provide industry record uptime. The ability to scale linearly on commodity hardware has allowed WhatsApp to keep our serving costs low. These days we run anywhere between 2 million and 3 million concurrent TCP connections on a single FreeBSD server as we documented in our blog post

– Jan Koum, CEO aka Sr. Tweet Manager, WhatsApp

Since opening its doors in 1995, pair Networks has been relying on FreeBSD as an essential tool for providing world-class web hosting. The reliability and stability of FreeBSD allows us to provide customers with server uptime well in excess of 99.9%. Our customers depend on the proven security of FreeBSD to keep their sites operational and their data secure. As an open-source system, FreeBSD is easy to update with new protections when security threats arise. We promise customers that their Web sites will always be hosted on state-of-the-art equipment and will have plenty of room for growth. The stability and robustness of FreeBSD makes it easy for us to live up to this promise

– Kevin Martin, CEO, pair Networks

Our position provides a multitude of angles on FreeBSD usage in the New York metropolitan area, from endusers exploring FreeBSD for the first time to enterprise infrastructures relying on FreeBSD. We manage to attract both the experienced and those dipping their toes into the *BSD water for the first time. While NYC*BUG plants a flag and maintains a steady *BSD presence, we benefit from the increased interest and reliance on FreeBSD as a stable, sane operating system. This is particularly true over the past few years, with the role of FreeBSD at Netflix and support for FreeBSD at the cloud service provider Digital Ocean, not to mention firms like Xinuos and New York Internet which rely heavily on the project

– NYC*BUG’s [email protected] Group, NYC*BUG

FreeBSD plays a major role in our flagship product, the Remote Business Accelerator. Though the majority of our team has roots in Linux, FreeBSD was selected for its lean footprint, extensive ports tree, and carrier grade applications supported on this incredibly stable operating system. Members of our team endorsed it as the system of choice with experience dating back 15 years to FreeBSD 4.1 while at the University of Kentucky.

We are thankful for the opportunity to build a product with the flexibility the BSD license presents. The Acceleration Systems team is happy to contribute to this project and help keep the internet a great place to learn and produce

– Jack McKinney, VP Engineering, Acceleration Systems

Mellanox Technologies has been a long-time developer and contributor in the FreeBSD community, integrating Mellanox leading-edge RDMA and other advanced offload technologies into the generally available FreeBSD operating system. Mellanox currently has three SRC committers on-board. We are happy and proud to continue sponsoring, contributing and maintaining the InfiniBand, RDMA, LinuxKPI, and USB subsystems, and to facilitate infrastructural changes in the ever-growing FreeBSD project.

– Yaron Gepstein, VP software, Mellanox Technologies

Tarsnap Backup Inc. is proud to support FreeBSD, both through my personal work (most recently, maintaining the FreeBSD/EC2 platform) and through its place as a Silver sponsor of the FreeBSD Foundation; and Tarsnap has directly benefited from projects and events which the FreeBSD Foundation has supported. Giving back is not merely an act of charity; it is truly an investment which yields an excellent return

– Colin Percival, President, Tarsnap Backup Inc.

Hobnob chose FreeBSD because it is the only operating system that truly supports our mission: Delivering fast and reliable network service to our customers

– Aron Hall, CEO Hobnob, Inc. 

The drive to make FreeBSD on Hyper-V successful rests almost exclusively on fact that many major appliances (network, storage, security and etc.) leverage FreeBSD as their base OS to build their product.

With the continued trend of virtualization, appliance vendors are increasingly moving from the physical appliance business to virtual as it significantly increases their gross margin by decreasing development and manufacturing costs. Ensuring these virtual appliances based on FreeBSD run well on Hyper-V, and eventually in Azure, is a strategically important investment for Microsoft as it ensures that as this trend continues that the Microsoft stack is the best for customers with private and public cloud deployments

– Jason M. Anderson, Principal PM Manager, Microsoft

FreeBSD has been an integral part of shaping many of today’s Internet technologies which benefit all Internet users worldwide. We have been using FreeBSD for decades, and based on our history, it has been a flexible tool adapting itself to the changing conditions that have occurred as the Internet has grown. Along the way, FreeBSD has been hallmark of stability, order, and management of one of the Internet’s most valuable resources — the “free” BSD operating system

– Marty Puranik, Founder/CEO, Atlantic.Net

Most of our local and remote contractors have had no problem transitioning to FreeBSD syntax and procedures for updating their development jail in a “real” UNIX environment where they have full control, as do our customers. This flexibility, coupled with the project’s continued commitment to stability, security and scalability made FreeBSD the right choice for most of our web development projects

– Jon Lybrook, Tera Bear Consulting

In 2002 when Igor started to work on the NGINX project, his main development platform was FreeBSD. These days we continue to use FreeBSD as a reference platform for NGINX and NGINX Plus development and testing. We appreciate its maturity, stability and impressive performance

– Maxim Konovalov, VP, Engineering and Co-Founder, NGINX

The Apache Software Foundation makes use of both custom FreeBSD Tinderbox and FreeBSD Update servers to rapidly perform application and base system updates across multiple datacenters in an automated, quick, and efficient fashion. The Apache Infrastructure Team frequently works directly with FreeBSD developers to stress cutting-edge features like ZFS under real-world loads

– Philip M. Gollucci, past VP of Apache Infrastructure, Apache Software Foundation

Developers that choose to colocate their servers with us also choose to install FreeBSD on their dedicated servers. The open source nature of the BSD license gives them the flexibility they need to develop innovative software. Plus, they have access to an enterprise level operating system that is free, has an active development community, and which lets them contribute their own skills to make the system better for their own development. We have asked several clients why they decided to use FreeBSD and the answer has always been the same: the cost and networking ability of the operating system rivals its commercial license competitors

– Albert Ahdoot, Director of Business Development, Colocation America

We annually test the operating systems of various Unix distributions. Each year, FreeBSD, starting from 4.X version, has been our primary OS

– Evgeniy Gordashnik, VP Operations, IXC

NYI is a data center provider that uses FreeBSD for all of its internal and customer-facing solutions for colocation and dedicated servers, cloud computing and managed services. Our initial choice of technology included commercial Unix systems tied to proprietary hardware. However, the cost and portability of FreeBSD were determining factors in our changing platforms early in our company’s existence

– Phillip Koblence, VP Operations, NYI

MSI/FUNTORO leverage FreeBSD to deliver high performance on-demand audio/video streaming services for buses, trains, stadiums and hotels.

FreeBSD was chosen for its stability and reliability, the easiness of upgrade and maintenance, the reliable of security updates and the amazing overall quality of the packages.


– Scott Chen, Managing Director, MSI/FUNTORO 

Beyond its technical strengths, FreeBSD comes with an outstanding ecosystem of developers, vendors, and users who openly share expertise, talent, and technical improvements. Netflix has embraced this community and is committed to giving back its bug fixes and enhancements, thus completing the circle of community collaboration

– David Fullagar, Director of Content Delivery Architecture, Netflix

Modirum is a small but growing, multi-national company that provides both software and hosted services for banks, merchants, payment service providers and card companies all over the world. We use FreeBSD for all our hosted services, from routers and firewalls to application servers and databases.

– Eirik Øverby, Chief Operating Officer, Modirum

NetApp proudly uses FreeBSD as a core component of our ONTAP storage operating system. With FreeBSD, we are able to deliver high performance products with the reliability, security and supportability that our customers expect. As a part of the FreeBSD community, NetApp is able to collaborate with industry leading technology companies. The FreeBSD Foundation has done a great job of driving FreeBSD innovation and facilitating cross corporation and industry collaboration. Your continued success contributes to the successes of all users of FreeBSD. Thank you

– Matt Hambrick, Director, ONTAP Engineering

About 3 years ago, Experts Exchange did extensive performance testing of our website several flavors of Linux and UNIX, including FreeBSD 7. FreeBSD outperformed all other tested operating systems in both page load time metrics and Lucene search index performance testing. Since that time, we’ve migrated our developer, test and production servers to FreeBSD. We’ve also used FreeBSD jails to host our developer test servers and have come to rely on FreeBSD throughout our local office datacenter and our co-location datacenter stack

– Andrew Alsup, Site Director, Experts Exchange, LLC.

Stormshield leverages off FreeBSD to deliver high performance UTM (Unified Threat Management) and Next-Generation Firewall technology since 1998. We continuously show our support for FreeBSD via technical contributions and sponsorship; as a company we are  totally committed to the on-going success of this great community.

– Fabien Thomas, Chief Innovation Officer, Stormshield

Netgate is a proud Silver Sponsor of the FreeBSD project. Without the FreeBSD community and the contributions of its members and benefactors, the pfSense project would not continue to thrive as it does today. Netgate is committed to giving back its bug fixes and enhancements and continuing its financial assistance of the FreeBSD project. We encourage anyone so-inclined to donate to the FreeBSD Foundation as well. Doing so helps to increase the evolution and the popularization of FreeBSD for everyone

– Jim Thompson, Chief Technology Officer, Netgate Inc.

Since making the change to FreeBSD, we have been pleased to see it live up to our expectations. The FreeBSD development community should be proud to have critical Internet infrastructure served on FreeBSD; their hard work makes the Internet safer and more reliable. Verisign is proud to participate in the FreeBSD development community and to have employees who contribute work back to FreeBSD as well

– Glen Wiley, Principal Engineer, Verisign, Inc.

The FreeBSD release system provides Juniper with a roadmap for features and a stable base for our code, while its practical licensing enables Juniper to develop intellectual property for advancing high-performance networking. Juniper employs many active FreeBSD developers that continually contribute to the FreeBSD project to further its development as a leading operating system

– Naren Prabhu, Vice President Foundation Technologies, Juniper Networks

You may not necessarily need to hear that FreeBSD is a reliable platform for running Internet services. But I think it’s important to remember that software like FreeBSD is affecting the way that people live their lives every day, whether it’s supporting businesses like ours, enabling hobbyists just getting into open source software, or any of the thousands of other “real world” roles it plays

– Chris Hardie, co-founder, Summersault Website Development

When Xinuos sought a mature and stable operating system with a modern feature set as an alternative for its installed base of clients, FreeBSD stood out as the obvious choice. OpenServer X, our version of FreeBSD, is what our customers require for running their business and Xinuos will support them for many years to come.

Our resellers especially appreciate the freedom of the BSD license, which provides the best flexibility in the industry for creating customized solution stacks. We expect the market for this license freedom and flexibility to grow tremendously in the coming years and we intend to help drive and support it. FreeBSD is a vital part of our future

– Sean Snyder, President & COO, Xinuos

Many of our largest customers have chosen FreeBSD, and due to the high quality of our support and commitment to FreeBSD, we have found that customers that choose FreeBSD most often choose Chelsio. We are thankful for the opportunity to be a part of the FreeBSD community. The Chelsio team is happy to contribute, learn and grow with the community

– Mehdi Mohtashemi, VP Engineering, Chelsio Communications

Due to the broad range of our solutions, we need to provide software and hardware that can optimize several hundreds of thousands of users sessions simultaneously. For this we need the most stable, efficient, supported and well documented network stack available, which we can also modify to our hearts’ content.

FreeBSD has been providing just that to XipLink since release 4.5. It made our first implementation of the Space Communication Protocol Standard a lot easier with its friendly BSD licensing model for kernel code, as well as, with the tremendous amount of documentation available on its network stack (especially the TCP/IP Illustrated Series by Wright and Stevens)

– Karim Fodil-Lemelin, Vice President of Engineering, XipLink Inc.

ScaleEngine’s small team of developers and systems administrators manage more than 100 servers in 38 data centers spread across 11 countries. Achieving this level of scale with such a small team is only possible because of the extensive level of documentation, observability, monitoring, and automation tooling available for FreeBSD. The ready supply of expertise also made FreeBSD especially attractive

– Allan Jude,VP Operations, ScaleEngine, Inc.

For us, sticking with and continuing to support FreeBSD is a no-brainer. We are proud to sponsor FreeBSD every year, and readily recommend it “hands down” when asked for our recommendation for a fast, battle-tested, and reliable platform

–  Mahmoud Al-Qudsi, NeoSmart Technologies

Headquartered in Cologne, Germany with offices in Chicago, San Francisco and Tokyo, cleverbridge has used FreeBSD for more than 12 years in our development, test and production environments. FreeBSD offers us unique security features, reliability, industry-leading technologies and an amazing performance. From our web servers, email servers to our storage servers, FreeBSD helps drive our global ecommerce solutions.

–  Paul Herman, Director of IT – Technical, cleverbridge

FreeBSD’s incredible security posture and updates, network performance, along with excellent IO and memory management make running this large, traffic heavy and mission critical application a much easier process. The operating system does a lot of the heavy lifting meaning my engineers can focus on product evolution rather than server maintenance.

– Jonathan Eastgate, Chief Technology Officer, simPRO

Isilon benefits from using FreeBSD in a number of ways, but the most important benefit is that we are able to leverage the open source efforts of the community to improve our product. Since we’re part of that community, we provide source code back, sponsor specific development efforts, and employ members of the community for contract development – this in turn gives us access to great people and continued access to great software.

In short, FreeBSD is a stable, mature, high-performance operating system with an active development community free from licensing questions and concerns

– Nicholas Kirsch, Director of Software Engineering, Isilon Systems

We believe strongly that what is good for FreeBSD is good for our customers, and what is good for our customers is good for us. The BSD License allows us to both use and contribute code freely, and allows our customers and the consumers of FreeBSD to do the same. FreeBSD has benefited from years of open sharing and collaboration which have resulted in a stable, mature, high performance operating system

– Josh Paetzel, Director of Information Technology, iXsystems


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Get Involved

No matter how big or small the task is, our volunteers within the community help keep the FreeBSD Project running smoothly. From on-going development projects tasks to creating documentation, there are multiple volunteer options available for you. Looking to get started with FreeBSD. Check out our How-tos. Join us in supporting the FreeBSD Project and helping grow the community worldwide.

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The FreeBSD Foundation proudly uses your donations to fund great projects like these.

Development of the “RAID-Z Expansion” Feature for ZFS

Project Status: In Progress

The Zettabyte File System (ZFS) is a combined file system and logical volume manager designed to protect against data corruption and support high storage capacities. The Foundation is sponsoring Matthew Ahrens to develop a “RAID-Z Expansion” feature. 

Linuxulator Diagnostics Improvements

This project will provide solid foundations for debugging failures encountered when running modern Linux binaries, and improving the Linux compatibility at both binary and source-level levels. It will also clean up the existing Linuxulator implementation and make it easier and quicker to port software originally written for, and maintained primarily under, Linux.

FUSE Userspace File System update

FreeBSD’s fuse(4) driver is buggy and out-of-date. It’s essentially unusable for any networked filesystem like CephFS, MooseFS, or Tahoe-LAFS. This project will fix all of fuse’s known bugs, update the kernel API, and add a new test suite.

if_bridge Performance Improvement

Project Status: In Progress

The current if_bridge implementation contends heavily on a single BRIDGE_LOCK mutex.  The overall idea is to replace the single mutex by two read-mostly locks, one protecting the overall bridge, and a second to protect the forwarding table. 

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Donor Spotlight

NetApp proudly supports the FreeBSD Foundation and the community to fuel continued innovation and extend the reach of the software. FreeBSD is a foundational component of our clustered Data ONTAP storage operating system, which underpins our Data Fabric vision and drives our fast-growing AFF all-flash arrays. The success of the FreeBSD operating system and the overall program is important to us, as your success contributes to our success. Thank you.

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