for anyone interested in looking Groestl was one of the 5 finalists for the SHA-3 competition.
The 5 were.
BLAKE, Grøstl, JH, Keccak, and Skein
Obviously keccak won the competition but only due to its innovative approach and not necessarily because of an increased level of security or performance.
http://nvlpubs.nist.gov/nistpubs/ir/2012/NIST.IR.7896.pdf
see section 3 for the selection process and reasoning.
Thanks for providing more information. I don’t know much about hashing algos, or Groestl, but I do know it’s a new efficient algo for GPU mining (having mined Groestlcoin on my GTX 750 Tis).