Mark up websites, graphics, and photos, or start brainstorming on a blank canvas. Browse the web with your friends or make that conference call more productive than ever. No plug-ins, downloads, or firewall voodoo - it's all here, ready to go when you are. Browser-agnostic, user-friendly.
The great thing about Twiddla is that you do not have to sign up. They will automatically create you a guest login but you can still create a meeting on the spot and invite attendees. It is easy to use and a great place for collaboration.