Our own LostJared is on a quest - not only a quest to port anything he can get his hands on to the PSP, but also to use all his releases as teaching tools to get other people involved with programming for the PSP. This time he's taken his earlier port of Masterpiece and added a shell which includes an on-screen keyboard, calculator, and another earlier port of Knight'sTour. As always, complete source files are are included in the package. Here's what Jared had to say:

This A Shell for MasterPiece it includes a On Screen keyboard,
Knights Tour, and a wanna be calculator.
It works for windows/PSP/Linux etc.

Im going to update this project everyonce in a while and add new features..
its just for fun and full source code is included..

if you have PSPSDK and SDL (for your system and pspsdk)
just type:

make psp && make && make pc

to build it from source..

this was tested on 2.0 with 0.9 Eboot loader..