bidirectional sync rsync alternatives

[amplatfus]

Hi all,

Because I saw that rsync can do only one-direction sync I started to search for bidirectional sync software. I found unison but I saw that is not on Entware repository. I will update here with other findings.

Could you please help me here with other alternatives for rsync with bidirectional sync that can be installed to Entware?
Thank you so much!