No, just piggyback off of a database. :-)

Seriously, have a relational database with transactions. When new jobs need to be done, add database entries for the needed work. Have a simple client process in a loop. It is connected to the database. At the start of the loop it tries to open a transaction and get work assigned to it. If it can it then does the work (ie one render) and marks it as done. If it cannot it sleeps for a while and tries again.

You can have other processes that add needed renders, check to see whether anything is taking a suspiciously long time, etc.