Auto-Layout for Sketch - Responsive design for Sketch
Cheat Sheets Dev - Community built to share popular programming snippets.
Achieving Zen With Auto Layout - Demystify auto layout on iOS and OS X
Found Wireframes - Found is a design asset with ready website blocks.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.