Google pays a handsome amount (~$6000) for their summer program Google Summer of Code. While I am aware of it, I can't seem to find other such Open Source programs or competitions to make some money in college. Is there a list available or do you know about something similar?
Websites for friends, orginizations. Maybe start building and maintaining a site for a group or club. Then branch out to family friends and small businesses around campus or back home.
Start listening to StartUpsForTheRestOfUs.com podcast. Start at the beginning you can follow Rob from selling drop ship beach towels, to a job board site, to an invoicing app, to an SEO SaaS, to building Drip and having a $XXM exit. Lots of tips and good advice for now and to build on for the future.
Don't work too much College is a lot of fun. Put in the work for your classes, meet people, go out and have fun. Work just enough for the money you have to have. Make the most of being there it's a great 4 to 5 or 6 years.
Find work at your school (low pay, but easy). I got ~$600-700 a month just to do basic jQuery stuff part time.
Part time internship (full time in summer) or job like most college students do.
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You probably will not make nearly enough money as with Google, but that should be enough. Also, focus on your classes + having fun.