Twiddla is described as '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 - its all here, ready to go when you are' and is an website in the Office & Productivity category. There are more than 50 alternatives to Twiddla, not only websites but also apps for a variety of platforms, including Windows, Mac, SaaS and iPhone. The best alternative is Zoom, which is free. Other great sites and apps similar to Twiddla are BigBlueButton (Free, Open Source), OpenBoard (Free, Open Source), Miro (Freemium) and Google Drive - Drawings (Free).
A Web Whiteboard is touch-friendly online whiteboard app that lets you use your computer, tablet or smartphone to easily draw sketches, collaborate with others and share them with the world. Works on all modern browsers, no installation needed.
GoToMeeting is an online meeting, desktop sharing, and video conferencing software package that enables the user to meet with other computer users, customers, clients or colleagues via the Internet in real time.
Connect with anyone, anywhere, anytime – without the fuss! FreeConference.com lets you hold free conference calls in HD audio with up to 400 people at a time and download free online meetings with video chat and screen sharing. All FREE, with no hidden contracts or fees.
Groupboard is a free collaborative whiteboard (drawing board), allowing you to draw and chat in real time with other people anywhere on the internet, even with users using a web browser or an iPhone/iPad. Use it for online tutoring, collaborative design, or just for fun!
A shared whiteboard for use by multiple Skype-users simultaneously. Features Instant collaboration Everything you draw or write is visible to all participants in real time. Share ideas just like you were in the same room.