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Lyft
Now available in 60 markets, Lyft is a ride-sharing program that works similar to a taxi service. Riders can hail a lift (er, Lyft) from their smartphone, but instead of a taxi, a regular person in his or her car will show up. Lyft is constantly hiring drivers, and at peak hours, they can make $35 an hour.
The side benefit? You'll get to meet lots of people (including, if you live in a startup hub, lots of people in tech) which can be great for networking. Just know you'll need your own car to work with Lyft, and that drivers pay their own gas, as well as wear and tear on the car.
TaskRabbit
Everyone knows the feeling of needing to get something done, but not having the time to do it. Whether it's heading to the post office to deliver a package, addressing 100 pieces of mail, putting together IKEA furniture, or hanging flyers about a garage sale, sometimes you'd just rather hand off the task to someone else. TaskRabbit gives busy people a way to hire a temporary personal assistant to accomplish pretty much any to-do—and gives others (you!) a way to pick up quick side gigs.
Elance and oDesk
If you'd rather sit behind your laptop then head out into the world, working for Elance or oDesk could be a great option. Both sites are marketplaces for freelancers, making it simple for businesses to hire copywriters, ghost writers, designers, programmers, and more. Create a profile, upload examples of your work, and then bid on any relevant projects. Not only can you make some extra money, but you can also build your resume and portfolio.
InstaEDU
InstaEDU (my company) connects students with great online tutors. Our tutors are predominantly current college students and recent college graduates, and tutors make $20 an hour. Online tutoring is a great way to put your college education to work in a flexible manner, and with the site's student reviews, you'll be able to build up visible proof of expertise in your area of study.
Source: https://www.themuse.com/advice/no-job-no-problem-how-to-work-for-a-startup-without-a-fulltime-offer