dashi by Premast - Create dashboards in a snap
Annotable - Ultimate image annotation & markup tool
Annotate by Convergely - Easily annotate images you get on Slack - just like Skitch
Annotate Screen - Browser based annotation tool.
Collaboration from CloudApp - Collaborate with commenting, annotations, and faster sharing
Kipwise - Save 💾 and annotate ✍️ articles seamlessly on Slack