  ScalienDB is a scalable, replicated database built on top of the Paxos
algorithm. It was developed from 2010 to 2012, when the startup backing it
failed. This paper discusses the design decisions of the distributed database,
describes interesting parts of the C++ codebase and enumerates lessons learned
putting ScalienDB into production at a handful of clients. The source code is
available on Github under the AGPL license, but it is no longer developed or
maintained.
