If you're debugging on a remote machine with a large pcap and no desire to scp it back to your desktop, termshark can help!

Tgif (originally the "Tangram Graphic Interface Facility") is a classic drawing program for 2D vector graphics. Image objects can be hierarchically constructed out of primitives such as polygons, text, and splines (though the splines Tgif draws are not Bézier curves).

Total Open Station (TOPS for friends) is a free software program for downloading and processing data from total station devices.

Explore Colossal Cave, where others have found fortunes in treasure and gold, though it is rumored that some who enter are never seen again.

Zoom is a player for Z-Code stories or games. These are usually text adventures (also known as interactive fiction), made popular in the eighties by Infocom with its Zork series of games, and others.

Calibre is a complete e-library solution. It includes library management, format conversion, news feeds to e-book conversion, e-book viewer and editor, and e-book reader sync features.