Google Open Source - All of Googles open source projects under a single umbrella
Marvel + Dropbox Paper - Embed wireframes and interactive prototypes in Dropbox Paper
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Kite Compositor - A powerful animation and prototyping application for Mac & iOS.
Open Source @IFTTT - A collection of IFTTT OSS projects.
Sketch The Ripper - Rip and share .sketch files on any OS in one click 💎