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