LimeLite - A simple, easy-to-use annotation tool for Mac
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
LightTag - The text annotation tool for teams
The Desk for StarUP - Design for Smart Working
Weava - Workspace to highlight, organize & collaborate on your research articles.
Annotate by Convergely - Easily annotate images you get on Slack - just like Skitch