The use of journal hierarchy for assessing the reputation of research works and their authors has contributed to a competitive environment that is having a detrimental effect on scientific reliability. Open access repositories administered by Universities or research organizations are a valuable infrastructure that could support the transition to a more collaborative and efficient scholarly evaluation and communication system. Open Scholar has coordinated a consortium of six partners to develop the first Open Peer Review Module (OPRM) for institutional repositories. The module integrates an overlay peer review service, coupled with a transparent reputation system, on top of institutional repositories. It is provided freely as open source software.