Weava - Workspace to highlight, organize & collaborate on your research articles.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Genius Annotations - Embed text annotations on your site. Annotate the web.
The Desk for StarUP - Design for Smart Working
Airsketch - Simple screenshots + annotations for Mac 🖥️
Annotate by Convergely - Easily annotate images you get on Slack - just like Skitch