http://antiquity.sourceforge.net/
(archival copy: https://archive.is/tcZmP )
License: BSD.
2020_05_14 citation from its home
page: "Antiquity is a wide-area distributed storage system designed to
provide a simple storage service and interface for applications like file
systems and back-up. The design assumes that all servers eventually fail and
attempts to maintain data despite those failures. Antiquity uses a secure log
to maintain data integrity, replicates each log on multiple servers for
increased durability, and uses quorum protocols to ensure consistency among
replicas. Antiquity's design has been evaluated on global and local testbeds.
It was tested running on 400+ PlanetLab servers storing nearly 20,000 logs
totalling more than 84 GB of data. Despite constant server churn, all logs
remain durable."