Treepad offers quite a few standard features including:

Articles and Nodes arranged in flexible treeview Tree Editing allows you to create any tree structure you choose Hyperlink support Multi-language includes most non-western languages

Treepad can be run from your hard drive, floppy, or from a flash drive. The flexibility allows you to take your data with you wherever you go. Treepad is available in several versions with additional features available for a modest cost. The standard Treepad program is available as a free download. Treepad Personal Information Manager [Treepad]