###Update April 30th, 2012

I manually ported this entry over from Posterous.

Assistly was acquired by Salesforce and rebranded as Desk.com.

I know that our own plan at Goodbits for Tender was grandfathered, and I suspect many of the other pricing plans have changed as well.

One other item to add to the list (although it's not really support, per se) is Intercom. It's an awesome customer dashboard and communication tool. See Kalv's write up about Intercom.

Further update: My answer today is Intercom - read the longer post on the Full Stack tools section ยป