[JoeAltmaier]

Rolling out a simpler design and a new website in a few days. Some of your objections will be met!

I'll answer here: there's a client for mac, windows, iOS and ipad. There's a web client too - but the conversation has to be hosted by a non-web client and invites sent as a url.

There's a headless Linux version but we use that on servers for media switching etc.

It supports call-out now (to any phone). Call-in is harder - you have to resolve an unsolicited call to a virtual office - we're working on it now.