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.

Quick Facts Initial release, Stable release ...
TreeLine
Initial release2001
Stable release
3.1.6 / June, 2023
Written inPython
PlatformLinux, Windows
Available inEnglish, French, German
LicenseGNU General Public License
Websitetreeline.bellz.org
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File formats

Export

TreeLine outlines can be exported as HTML, per-data type user defined formatting. In addition, it supports exporting outlines as an OpenDocument ODT file, OPML, various delimited text file formats, and as "plain" XML.

Import

TreeLine can open "plain" XML files, displaying the contents as an outline. It can import browser bookmarks.

File format

TreeLine uses a simple XML syntax to store data, with a .trl extension.

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