I've heard of freeware and shareware and copyleft software. This is a new term I encountered today when I actually had a look through the license agreement. It made me think what nice people nerds are.
"Vim is Charityware. You can use and copy it as much as you like, but you are
encouraged to make a donation for needy children in Uganda. Please see |kcc|
below or visit the ICCF web site, available at these URLs:
You can also sponsor the development of Vim. Vim sponsors can vote for
features. See |sponsor|. The money goes to Uganda anyway."