Dateutils are a bunch of tools that revolve around fiddling with dates and times in the command line, with a strong focus on use cases that arise when dealing with large amounts of financial data. Their target market is shell scripts that need date calculations or calendar conversions, and as such they are highly pipe-able and modeled after their well-known cousins (e.g. dtest vs. test, or dgrep vs. grep).
Evolution is a personal information management application that provides integrated mail, calendaring and address book functionality.
calcurse is a calendar and scheduling application for the command line. It helps keep track of events, appointments and everyday tasks. A configurable notification system reminds user of upcoming deadlines, the curses based interface can be customized to suit user needs and a very powerful set of command line options can be used to filter and format appointments, making it suitable for use in scripts.
Freeplane is a mind mapping and knowledge management software. Its easy-to-use interface supports thinking, sharing information and getting things done. Notes can be freely positioned, as unconnected nodes, or as ordered ideas in a hierarchy. Any node can be classified with meta attributes, different manual or automated styling, grouped, connected with links, arrow lines or labels. Nodes can also be structured by content (text, formulas, calculations (LaTeX), images or hyperlinks). It also inclu
ETMtk is a calendaring and todo list manager. It utilizes a concise and free-form text format and storage to keep dates and associated events or tasks. It's based on Python and TkInter and works on Linux, MacOS and Windows.