OpenAIS is an open source implementation of the SA Forum Application Interface Specification based upon extended virtual synchrony. The project currently implements APIs for application failover, application defined checkpointing, application eventing, extended virtual synchrony, and cluster membership. With this software it is possible to write redundant applications that tolerate hardware, operating system, and application faults.
In 2H 2005, the Linux-HA project will partner with the OpenAIS project to be able to use OpenAIS as its low level communication layer, allowing OpenAIS and Linux-HA to be fully compatible and interoperable with each other.
OpenAIS home page, (freshmeat entry).