MakaGiga is a free, easy-to-use, cross-platform application for doing a variety of tasks, such as text editing, todo listing, feed reading, and simple image viewing/editing. Plugins are used to implement its various capabilities.
It can perform file import/export, backing up files into a zip file, Internet searching (Google, Wikipedia), and more. The interface features custom colors, a tabbed view, and labels and comments for each file or folder.
Requires Java Runtime Environment (JRE) 6 or above.

Features:
1. To-do manager, Notepad
2. RSS feed reader
3. Widgets (calendar, sticky notes, etc.)
4. Plugins (image viewer, Internet search, and more)
5. Portable
6. Versions for Linux, Windows, ...
7. Document import/export
8. It's free and open-source!

The license of this software is Free, you can free download and free use this planning software.