Anima App - Design, get feedback, convert to code, publish, iterate.
Disciple - Grow, engage and monetise your community with Disciple community software. Get your own branded community platform on Web, iOS and Android
Sketch Repo - Collection of resources for anyone who uses Sketch
Forumotion.com - Create a free forum : free forum hosting, free forum skins, templates editing, chatbox, RPG mod... Choose PhpBB 2 - 3, Invision or PunBB. Create forums now!
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Proboards - ProBoards is a host of free forums with customer service.