BaiBoard!

Lucidchart is an online diagram and flowchart software that supports Microsoft Office Visio import and can work on any operating system. The easiest way to draw flowcharts, wireframes, UML diagrams, network diagrams, mind maps, iPhone mockups, site maps and more. Work together in real time with your team and clients! Along with the online version, Lucidchart also has a downloadable solution that runs on Mac, Windows and Linux; this enables offline editing at any time! »

Lucidchart is an online diagram and flowchart software that supports Microsoft Office Visio import and can work on any operating system. The easiest way to draw flowcharts, wireframes, UML diagrams, network diagrams, mind maps, iPhone mockups, site maps and more. Work together in real time with your team and clients! Along with the online version, Lucidchart also has a downloadable solution that runs on Mac, Windows and Linux; this enables offline editing at any time! »

Conceptboard goes beyond the idea of online whiteboards and adds realtime collaboration, document sharing, visual feedback, task management, live meetings and more.

Groupboard is a multi-user shared drawing board that you can place on your web page by simply copying a few lines of HTML code. You can also run Groupboard on your own web server. It can be used for tutoring, distance learning, training, or simply for fun! With the whiteboard you can upload background images and draw on top of them, and all users connected to the board will see the changes in real-time. Works on any web browser including iPad, iPhone and Android. Free for 5 users.

Whiteboards for your team. Draw together. Sketch, share, collaborate, and brainstorm with your remote team like never before. Integrated with Slack and other tools you already use.

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.