Openrsync: An implementation of rsync, by the OpenBSD team

Openrsync is a BSD-licensed implementation of rsync developed by the OpenBSD team that is compatible with modern rsync versions while supporting only a subset of command-line arguments. Originally created for the rpki-client project, it is officially supported on OpenBSD but compiles on other UNIX systems and includes both functional and unit test regression systems. The project welcomes issues and pull requests, with comprehensive documentation available in its manual pages.