if you are interested in working online without investing any money, then you must try 
http://www.microworkers.com 
there are micro jobs available.
high klout jobs are available with $0.3 and above. 
hire group jobs are available which you can do the same multiple times with changing the identity (like email address).
And also sign up jobs are available for you. 
Cheetuh works are available which gives instant payout. 

If you work hard, then you earn more. $100+ per month. 

             Thank you