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osync vs csync2: catalog facts
osync	csync2
Free Free and open source.	Free Free and open source.
Linux, Command line	Linux, Command line
Bidirectional sync on top of standard rsync Fault tolerance and POSIX ACL support	Synchronizes files across many hosts at once Tracks file state in a database to detect conflicts
Command-line only, configured through files Needs rsync and a Unix-like shell environment	Aimed at server clusters, not desktop users Command-line and config file only
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.