I have been jail breaking my devices for years now. If you are like me you find it overwhelming to find the best repos. Well I made it easy right here for you. All you need is a few. You can pretty mush find all the hacks you need from just a few repos. The less sources you have installed the more efficient your iPhone will run. Jail Breaking is legal for those wanting to know. You can get some cool tweaks from these sources.
1. Hackulo
http://cydia.hackulo.us/
2. xSellize
http://cydia.xsellize.com/3. Sinful iPhone
http://sinfuliphonerepo.com/
(it appears that sinful is down at the moment but it is one of the best to have. Just keep checking on it from time to time.)
These are the ones I use. I will add more if needed or if I find any that I must have.
NOTE: Jail Break at your own risk, and add these repos at your own risk. I am not responsible if you hack your iPhone and you dont know what you are doing.