Sites and apps similar to skrbl include Conceptboard, which has a free version. Other options are Twiddla, Coccinella, Groupboard and iDroo. You can choose from more than 10 Whiteboards like skrbl for iPad, Android, iPhone, Mac and Windows.
Conceptboard goes beyond the idea of online whiteboards and adds realtime collaboration, document sharing, visual feedback, task management, live meetings and more.
Germany
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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.
United States
Coccinella is a free and open-source cross-platform instant messaging client with a built-in whiteboard for improved collaboration with other people.
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!
United States
iDroo is a browser-based online whiteboard and teaching platform for tutors, teachers, students and teams. It runs in a web browser without a desktop installation.
EstoniaEU
Draw on the . net is an online, multi-user, drawing website. You can also use it to draw on web pages. It is quick and easy to use.
The easiest way to draw together with your friends on-line.
Scribblar is a free online collaboration tool that is perfect for online tutoring. It features live audio, chat, whiteboard, image sharing, document sharing and more. Used by learners, trainers and schools around the world, Scribblar is quickly becoming the favourite tool for...
A real time shared whiteboard in your browser, teach, explain, sketch. For work, study, fun. Save all your whiteboard for later use.
United States
Board800 is an interactive whiteboard application which uses Red5 as the back-end media server, and flash (.swf) as the client front-end. The primary features include
CoSketch is a multi-user online whiteboard designed to give you the ability to quickly visualize and share your ideas as images.
DenmarkEU
WrittenUp is a website that allows remotely collaborating users to instantly write and draw on a virtual whiteboard, using their tablet or computer. It features multiple pages and PDF exporting.
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