Invision - Prototyping and collaboration for design teams
Justinmind - Define awesome experiences through wireframes & prototypes.
Visualtip - A service that allows designers and clients to annotate and collaborate on images in real time
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Pastel - Sticky note-based feedback collection tool for live websites
avocode - Centralize design collaboration, version control, prototyping, feedback, and developer hand-off with Avocode. Work on any design, anywhere, with anyone. Sign up free 👉 https://avocode.com/.