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