ROMA is a Ruby-based distributed key-value store (NoSQL) developed by Rakuten Institute of Technology in collaboration with Ruby creator Yukihiro Matsumoto since 2007. It uses a pure peer-to-peer architecture with consistent hashing and virtual nodes to provide high scalability and fault tolerance. The open source ROMA project includes the core ROMA software, Gladiator GUI management tool, and documentation on using and benchmarking ROMA.