Free collaborative online mind-mapping tool.

Powerful and free collaborative mind mapping tool.

Very cool and good looking online, collaborative mind mapping tool.

MindMeister supports all the standard features of a classic mind mapping tool - only online, and with as many simultaneous users as you like.

rCache gives you your own research repository online - where you can store articles, blog postings, documents and images. All of your stuff can easily be tagged and there's also full-text keyword searching. Currently there is only support for Firefox users and there is an extension for the browser which you can use for web scraping.

Use Acorn's creativity tools to store your business ideas, inventions, projects, songs, thoughts, poems, innovations, and quotes. Organize your thoughts by category and keyword. You can then share or collaborate with other users if you wish.

Bubbl.us lets you create little thought bubbles and connect them together. You also can easily move the bubbles around or change the links connecting them to each other.