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I have been looking for decent two-way file replication software either for Windows or Linux for a long time. Until Windows 2003 R2's DFS Replication, I couldn't find a single viable product/application to do it. While Windows 2003 R2's DFS Replication works very well (surprisingly well) I would like to have a non-Microsoft option that doesn't require so many prerequisites (Active Directory, etc) and is a little more lightweight. Something that runs on Linux would be ideal.

If anyone has any suggestions, please, share!