the Bliive guys are really nice. I contacted them some months ago to know if they would open-source the stack and they quickly replied (that they couldn't yet though).

I am involved (until the next meeting, I plan to resign from the managing committee) in a LETS (local exchange trading system) and one of the benefits we seek is to (re)create "social link" between people of the same geographic community.

Bliive doesn't put the accent on that, it seems to rely on internet/skype for contact.

Timebanking is an interesting topic. In the Dane County they are using it for some young offenders instead of criminally charging them. http://danecountytimebank.org/projects/dctb-youth-court-comm...