sc is a curses-based spreadsheet program that uses key bindings similar to vi and less.
Alpine is a fast, easy to use mail client that is suitable for both novices and experienced users. It is the latest version of Pine, developed by the same team but renamed to avoid trademark issues.
rainbarf provides fancy resource usage charts to put into the tmux (and GNU screen) status line.
A data quality solution that includes a profiler, validator, and comparator.
A lightweight yet extensible Java commandline options parser.