Here are some freeware tools and games for Windows from Lucid Technologies. All programs include a user manual in the ZIP archive.
If you program old 8-bit microprocessors or microcontrollers you probably use S19 or HEX files. This program allows you to view, convert, and compare S19 and HEX files. Files are compared address by address over the entire 64k address space of 8-bit microprocessors.
This program simulates the airborne fire control radar found in the F-4E Phantom II. See if you can run a successful radar intercept. See it on YouTube.
This game is an updated version of the great Star Trek games from the 1980s that used limited "terminal graphics". This game includes sound and limited color graphics. See if you can destroy invading Klingon and Romulan warships. See it on YouTube.