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

File formats

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Export

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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

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

File format

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

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