I haven't heard of any publicly available implementations of Pregel, per se. The Pregel paper does describe some other related and publicly available framework

I haven't heard of any publicly available implementations of Pregel, per se. The Pregel paper does describe some other related and publicly available frameworks for graph algorithms, but I haven't played with any of those frameworks. Details are in the second last section of the paper: http://www-bd.lip6.fr/ens/grbd2011/extra/SIGMOD10_pregel.pdf http://www-bd.lip6.fr/ens/grbd2011/extra/SIGMOD10_pregel.pdf