CGminer
This software is, currently, the most popular GPU/FPGA/ASIC miner. CGminer is an open source GPU miner written in C available for several platforms like Windows, Linux and OS X. One of the things that make it extremely popular is the fact that it’s based on the original code Cpu Miner, which you can discover in Bitcoin Wiki.
This software includes overclocking, monitoring, fans peed control and remote interface capabilities. His other features include self detection of new blocks with a mini-database, binary loading of kernels, multi GPU support and CPU mining support. There are a lot of other characteristics you can discover here, at CGminer official forum.
Download CGminer here.
https://github.com/ckolivas/cgminer