Hi, not as such, we were looking into peer review options last year, there is one called WebPA in the UK which I think is opensource but I've only briefly tested it.
I asked around and a few people suggested using wikis for peer review.
I can't think of any opensource mobile ones off top of my head, Gavin Cooney of Learnosity mentioned something recently but I don't know if their mobile platform is fully open source or not.
Nicola