Open Source

We’re passionate about open source. Not only do we use open source software in our own products, but we also regularly contribute to Varnish, Chef, Ganglia, and many other leading open source initiatives.

Fastly is committed to helping developers move their open source projects forward. If you’re in need of a content delivery network, give us a shout.


Fastly currently supports the following projects by providing them with free content delivery:


Bundler provides a consistent environment for Ruby projects by tracking and installing the exact gems and versions that are needed.

The Debian Project

The Debian Project is an association of individuals who have made common cause to create a free operating system.

HTTP Archive

HTTP Archive is a permanent repository of web performance information such as size of pages, failed requests, and technologies utilized. It tracks trends in how the Web is built and provides a common data set from which to conduct web performance research.


MetaCPAN is an open, next generation CPAN API and search site.

MIT Media Lab

Actively promoting a unique, antidisciplinary culture, the MIT Media Lab goes beyond known boundaries and disciplines, encouraging the most unconventional mixing and matching of seemingly disparate research areas.


OpenStreetMap is built by a community of mappers that contribute and maintain data about roads, trails, cafés, railway stations, and much more, all over the world.

Python Packaging Authority

The “Python Packaging User Guide” (PUG) aims to be the authoritative resource on how to package and install Python distributions using current tools, but also on the efforts to improve Python packaging.

Python Software Foundation

The Python Software Foundation is a non-profit organization devoted to the Python programming language.


Ruby is a dynamic, open source programming language with a focus on simplicity and productivity. is an open source tool that helps you analyze your website speed and performance based on performance best practices and metrics.


The World Wide Web Consortium is the main international standards organization for the World Wide Web.


Video.js builds on HTML5 by fixing many cross browser bugs or inconsistencies, adding new features that have not been implemented by all browsers, as well as providing one consistent JavaScript API for both HTML5, Flash, and other playback technologies.


PerfBar is a tool that puts dozens of metrics (as well as budgeting and custom metric support) at the tip of your fingers with just a single script include.


Haskell is an advanced, open source, purely functional programming language which is the product of more than 20 years of research.

Fastly uses and contributes to:


We use Chef to automate how we manage scale and complexity in servers and their services.


We use Ganglia as part of our monitoring system. Additionally, one of our software engineers has extensively contributed to and written about monitoring with Ganglia.


The maintainer of Memcached works at Fastly, and we use it to ease the load on databases.


Perl is a highly capable, feature-rich programming language, and one of the programming languages we use at Fastly. Our CEO wrote the threading library for Perl.

Varnish Cache

Varnish is an HTTP accelerator designed for content-heavy dynamic web sites. We’ve built our global network from open source Varnish Cache because of the flexibility of its control language. Our engineers frequently contribute to the Varnish code base and share their experiences with the project at events and meetups.

Fastly employees have made and open sourced:


A general purpose real-time charting library for building beautiful, smooth, and high performance visualizations.


Avalanche is a controllable fault injection tool for testing high load distributed systems.

You can also see Fastly’s open source libraries on our API clients page.