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Tabbed notebook, outliner and personal information manager, with tree structure and strong encryption.
ukolovnik is a simple todo manager written in PHP and using MySQL as its backend. It does not provide multi-user functionality, just everything you need for a personal todo list.
FirstThingsFirst is a multi-user webapplication (written in php and ajax enabled) which enables you to define and maintain an unlimited number of different user-defined lists. Examples of possible use: todo list, cd collection list, etc.