We have chosen to use

MPOS from https://github.com/TheSerapher/php-mpos, now it has some "issues" it is NOT recomended for a production service as yet, we have taken a gamble with it

Stratum is simple enough just google howto install stratum.

Took us a little over 3 days of trial error and restart, and several OS Platforms, we opted for Ubuntu Server 12.10 in the end for simplicity

When you invite people to come and test, be straigh with them, make sure its a known test, and there there will almost certanly be a few hiccups