I've been using this bot for a while and it works really well, so decided to share.
-0-30 lvl in about 4 days assuming you run it 24/7
-The code used to be open sourced and the current version is a modified one of the original
-Simple to use, low impact on performance
-So far undetected by LoL
How to use
-Open LeagueBot.exe
-Type StartCoop and press enter
-Login to your League of Legends account on client (click remember me)
-Like this post if you don't want to be leecher PepeKnife
-Enjoy!
Link: