Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
Artboard Studio - Online graphic design app mainly focused on product mockups.
Spectrum - Browser-based app to visualize the frequencies of an audio file.
Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.
Skype for Slack - Move your slack discussions to a group skype call
ProtoSketch - Powerful yet simple vector graphics editor and prototyping