[galaxy-dev] Recommendation for Grid/Cluster management ?

Slightly off-topic, but for a new Galaxy installation - What would you recommend for a free (FOSS) Grid/Cluster management product ? SGE is not free any more (Oracle Grid Engine is "90-days evaluation, binaries only" free, starting 6.2u6). Ease of administration is top-priority, more than sophisticated scheduling policies (and of course it has to be well supported by Galaxy). Any suggestions ? -gordon