Nylas Mail is an open-source desktop email client by Nylas, known for its emphasis on user-contributed extensions.

GitBook began in mid-2014 as an open-source tool for developers to build documentation. Today we empower teams of all sizes to share knowledge and build great internal & external docs.

Franz is a messaging app for WhatsApp, Facebook Messenger, Telegram, Slack and more.

At GitHub, we’re building the text editor we’ve always wanted: hackable to the core, but approachable on the first day without ever touching a config file. We can’t wait to see what you build with it.