Possibly one of the best monochrome GROB editors. Contains various files, including English and French versions in both library and variable format, along with source code. English translation by Fin; HP 38/39/40 port by HP-Poska.
Lets students work with matrix calculations as quickly as possible. When it starts, it displays a list of matrix calculations you can perform (add, subtract, inverse, etc.). After choosing one, the program asks you for two matrices, namely M1 and M2. Once that's done the answer is automatically displayed and stored in M1. I've even programmed it to detect when certain calculations aren't possible. While this may sound like a lengthy process, it does take place a lot faster.
Various music files including Blister in the Sun, Charge, Come As You Are, Dumped Again, Flintstones Theme, Funeral March, Happy Birthday, Mary Had a Little Lamb, Nick's Song, The First Noel, and more.
This is an ingeneous and excellent add-on that is basically a really neat total waste of time :-) When you download the library to your calculator it will put a ticking clock at the bottom of the HOME view. It displays both the date and the time (once you've set them) and uses both 12hr and 24hr time format and both US and European date format.