Groestlcoin is a cryptocurrency that utilizes the Groestl algorithm for Proof-Of-Work. Groestlcoin aims to make mining possible for everybody, be it on an old CPU or a new GPU. There is roughly a 5x-10x hash difference between CPU and GPU mining. This is much smaller spread than that of Scrypt coins.
The Groestl algorithm has one of the lowest power consumption, heat, and noise when compared with other algorithms. No ASIC currently exists for Groestlcoin and it is likely that Groestlcoin will be ASIC-free for the foreseeable future. The features of the Groestl algorithm allows for a fair distribution of the cryptocurrency.