oclhashcat-lite with GPU Cluster

[Rolf]

do it like this: http://www.super-key.com/phones/oc/oc05.JPG

This is amazing.
But is there any software based solution? i.e. via ethernet network to join together PC-s power and work on one phone at a time.

Short answer: yes.
Long answer: Google.

IIRC, it's not free, but hey, it supports SL3 cracking.

Additionally, if you donate some $ to BitWeasil, he may implement SL3 algo in his free cracker, which supports network distribution.