What are some alternatives?
When comparing Limnu and A Web Whiteboard, you can also consider the following products
Miro - Scalable, secure, cross-device and enterprise-ready team collaboration tool for distributed teams. Join 2M+ users & 8000+ teams from around the world.
RealtimeBoard - RealtimeBoard is an online collaboration software created as a team collaboration and online brainstorming tool. It's super easy to use & free!
Whiteboard Fox - Simple Online Whiteboard
Aggie.io - Draw a picture together with your friends in real-time over the internet in your browser.
Jamboard - Interactive Business Whiteboard | G Suite
DrawPile - Drawpile is a drawing program that lets you share the canvas with other users in real time.