Play, learn basic strategy, test card counting... Had to try this for myself after first learning of the MIT card counters long before they turned it into a movie.
A dictionary program with "flash cards" for studying words. Wrote a vocabulary dictionary of hard words intended for students aiming to improve their college board tests.
I grew discouraged when I couldn't get anyone I knew to even try the program, but I'll see if I can get an installer posted here in case anyone wants to try it.
File Browser / Editor: "multi-file" editor for making changes to html files or any group of files en masse, as well as providing views of most audio and visual file types (mp3, wav, mid,... bmp, jpg, gif, wmf,... wmv, avi, mpeg,...). Generate basic HTML that links to a selection of files. HTML to text converter. Deleted file recovery. I've been using this program every day for years.