acid-state, http://acid-state.seize.it/ http://acid-state.seize.it/, which was previously known as happstack-state, and before that HAppS-State, has been doing

acid-state, http://acid-state.seize.it/ http://acid-state.seize.it/, which was previously known as happstack-state, and before that HAppS-State, has been doing it since 2005 or so. acid-state currently lacks replication/multimaster support, but happstack-state has had several experimental implementations of that as well. acid-state is Haskell specific.. but that is part of the appeal. You can directly store fancy algebraic data structures with acid-state. You are not limited to a simple combination of records integers and strings (for example).