|Stable release||1.4.1 / November, 2011|
|Available in||English, French, German|
|License||GNU General Public License|
TreeLine is a free and simple outliner with advanced data element definition and export abilities. It uses a basic tree structure to organize information, and allows the user to define different types of nodes and leaves.
TreeLine outlines can be exported as HTML, per-data type user defined formatting. In addition, it supports exporting outlines as an OpenDocument ODT file, various delimited text file formats, and as 'plain' XML.
TreeLine can open 'plain' XML files, displaying the contents as an outline.
TreeLine uses a simple XML sytax to store data, with a .trl extension.