I like Paint Shop Pro, actually prefer it to PS for some things because it uses much less resources. And it's very inexpensive. I'm running an older version (PSP6), roommate has PSP7 which is even better. However I read years ago that the newer versions aren't as good because the company changed hands, therefore I never upgraded. Mine still runs under Windows 7 but I'm starting to see little signs (like, an error message every time I open it) that it might not be compatible with Windows much longer.

It can do all the basic things PS does. But it barely has things like filters and brushes.