Freeplane is a free, open source software application for creating mind maps (diagrams of connections between ideas), and electronic outlines.

Written in Java, it is supported on Windows, Mac OS X and Linux, and is licensed under the GNU GPL version "2 or later".

It includes the following new features: Version 1.3 was published ((date)).

One feature of Freeplane is the support for installable enhancements.

Add-ons are a way to extend and customize Freeplane similar to how plug-ins and extensions can be used to extend and customize well-known applications like Firefox or LibreOffice.