Haiku - Haiku is an open source OS catered specifically to the needs of personal computing.
Marvel + Dropbox Paper - Embed wireframes and interactive prototypes in Dropbox Paper
Creo - Creo is a modern design tool for Mac which combines design and development.
Kite Compositor - A powerful animation and prototyping application for Mac & iOS.
Flinto - The prototyping tool designers have been waiting for.
Sketch The Ripper - Rip and share .sketch files on any OS in one click 💎