I've been working on something that just monitors ZooKeeper to add and remove nodes from collections. the use case being I put SolrCloud in an autoscaling group on EC2 and as instances go up and down, I need them added to the collection. It's something I've built for work and could clean up to share on GitHub if there is much interest.
I asked in the IRC about a SolrCloud supervisor utility but wanted to extend that question to this list. are there any more "full featured" supervisors out there? -renning
