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ZooKeeper is a highly available coordination service for data centers. It originated in the Hadoop project. One can implement locking, fail over, leader election, group membership and other coordination issues on top of it. Are there any alternatives to ZooKeeper? (free software of course)
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Yes, there is also Doozerd (https://github.com/ha/doozerd). Take a good look at it, it's a nice, single binary distributed coordination service developed by Heroku. With bindings/libraries for java/python/ruby/node. Very easy to get started with and play around.
Just discovered Accord (C) and OpenReplica/ConCoord (Python) which may be interesting solutions
[EDIT] The Hashicorp crew, of Vagrant and Packer fame, are cooking "a decentralized solution for service discovery and orchestration" called Serf.
[EDIT2] Hashicorp strikes again ! They just released Consul, built on top of Serf. The pitch: "a solution for service discovery and configuration, completely distributed, highly available, scalable to thousands of nodes and services across multiple datacenters".
It seems Corosync is also like ZooKeeper.
OpenReplica from my research group is a highly available FOSS coordination service for data centers. It can be used for implementing locking, fail over, leader election, group membership and other coordination services. It differs from ZooKeeper in two critical ways:
It uses an object-oriented API. This makes it much easier to write coordination services. Synchronization code for OpenReplica looks exactly like its textbook counterpart; there is no need to master a file and upcall-based API like in ZooKeeper and Chubby.
It enables dynamic membership updates to the replica set. There is no need for static configuration files. The system is integrated into DNS (authoritative, slave for OpenReplica, or Amazon Route 53).
We actively support the system, do not hesitate to let us know if you have further questions.
There's a project called Noah on github that looks interesting, it says that it's "loosely based on Apache ZooKeeper" https://github.com/lusis/Noah with REST support being a key feature (ZK has this as a contrib/option rather than built in).