We're joining the Open Source Pledge because our business is built on and with open-source software. We will spend at least $2,000 per full-time developer on open-source projects and maintainers. Sentry launched this initiative after a $500,000 distribution across their open-source dependencies, and others followed.
Sustainability of open-source projects has been an ongoing discussion subject for decades now with a great many ideas and projects trying to "solve" issues around it, a lot of which failed, or didn't have a big impact. There's a great write-up of the state of open-source sponsoring by Scott Chacon over at GitButler which matches a lot of our thoughts on the subject. This pledge won't be the answer to open source sustainability, but if we manage to get a lot of companies on board it can have a major impact.
Private Packagist was built with the very idea in mind of finding a business model to sustain developing the Composer open-source project. While it took us a few years, it is working. So, of course, we spend plenty of time and money on our own open-source project Composer, but we're not going to include this here. Instead we'll focus on what we to do sustain the ecosystem around us: the tools we work with and build on top of.