Usysze

Usysze is an open‑source, lightweight file synchronization utility designed for cross‑platform use on Windows, Linux and macOS. The project originated in 2019 as an initiative by the SysSync Foundation, a nonprofit focused on improving collaborative workflows for small teams. Its core features include deterministic file replication, a distributed hash table for conflict resolution and optional end‑to‑end encryption using the Ed25519 curve.

The software is distributed under the MIT license and can be installed via package managers such as apt, Homebrew and Chocolatey or directly from source on GitHub. The command‑line interface uses a declarative configuration file in YAML format, allowing users to specify source directories, target peers, bandwidth limits and synchronization policies. An optional GUI client, Usysze‑UI, is available for users who prefer a graphical workflow.

Usysze supports both unicast and multicast networking modes. In unicast mode, one node acts as a leader and pushes changes to followers; in multicast mode, nodes gossip updates in a peer‑to‑peer fashion, which is useful for ad‑hoc networks with intermittent connectivity. The tool also includes a built‑in HTTP API for integration with other services, such as CI/CD pipelines and remote backup solutions.

Documentation and community support are maintained through the Usysze Wiki on GitHub and a mailing list moderated by the foundation. The project’s roadmap includes support for incremental delta compression, integration with cloud storage providers and a plugin architecture for extending synchronization logic. Continuous integration tests run on GitHub Actions and Travis CI to ensure stability across all supported platforms.