TreeLine (outliner)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.WWW Official SiteFile formatsExportTreeLine 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.ImportTreeLine can open "plain" XML files, displaying the contents as an outline. It can import browser bookmarks.File formatTreeLine uses a simple XML syntax to store data, with a .trl extension.Similar programs Zim Wixi KeepNote KJots Tomboy Notecase Gnudiary GNote Tiddlywiki