OffTopic: Free Mobile Tethering/WiFi Android

So I just rooted my Samsung Galaxy S3 (cant afford the S4 yet) and I was just wondering if anyone has rooted their phone and has found a good app that allows for free tethering instead of paying the rediculous price via phone provider. I've found some great apps that allow me to speed my phone up/overclock and save my battery life, but nothing on the side of free tethering that was 100% bulletproof. I found one app that allows me to get free tethering but boots me off within 30secs-1min of use.