[balu]

Not an expert, but TeleHash [1] might be a more lightweight alternative than freelan for a lot of applications.

[1] https://github.com/quartzjer/TeleHash/blob/master/org/v2.md

[kika]

wow, I didn't follow this field for a while. Seems to be a great thing, but it's not an alternative, it's a higher layer. Telehash may provide naming, addressing, etc, while the stack I'm talking about basically provides UDP connectivity between parties.