I think we should consider Loomio.
I've just discovered the New Zealand-based, now global, enspiral network which includes the decison-making forum loomio and the collaborative funding platform co-budget. They are all about online distributed non-hierarchical collaboration for good and have a working model with working tools. (I highly recommend that you explore those links and those people!)
I started using it a few days ago. I m going to propose to
* demo it
* record and advance our deliberations on
* the google proposition
* Jeremy's role as liaison
* auxiliary propositions re the 2018 Conference
* propose that we adopt the tool.
This thread is for discussing Loomio.
I'm creatng a new thread called "Endorsing and advancing the Portland2018 plan"