Weava - Workspace to highlight, organize & collaborate on your research articles.
Marker.io for Slack - Turn screenshots into Slack messages ✌️
Good Annotations - A online annotation tool that is perfect for providing feedback to your team.
Airsketch - Simple screenshots + annotations for Mac 🖥️
Genius Annotations - Embed text annotations on your site. Annotate the web.
TextSnatcher - How to Copy Text from Images ?