Invision - Prototyping and collaboration for design teams
Visualtip - A service that allows designers and clients to annotate and collaborate on images in real time
Plant - Version control app and plugin for Sketch
Pastel - Sticky note-based feedback collection tool for live websites
FOLIO - Simple version control app for designers based on Git
Savahapp - The all-in-one design sharing, collaboration, workflow and app prototyping platform