How do you benefit the most people?
With open source software.
The following is a collection of ( abeit buggy ) Open Source( GPL ) software, written for the Macintosh, by Charles Higgins.
My Art Does Not Need Approval!
Kanji Crammer - flash cards for learning Japanese Kanji ( Chinese characters ) and others
Passage Crammer - study passages of text and audio
Movie Crammer - Movie viewer
Image Crammer - image slide show
ToneLab - Guitar tuner