DigitalPermits uses TeamCity
TeamCity is our main continuous integration server. It starts creating builds and running tests based on commits that we make in our hosted bitbucket repositories. From there, we have a set of configuraitons that can deploy the built and tested artifacts (web app, batches, db, etc...) to a stage or production server. We still release manually, but we release often, and TeamCity has nice features to help us roll back when things don't work out as planned.
Stack Exchange uses TeamCity
TeamCity builds then copies to each web tier via a powershell script. The steps for each server are:
saigkill uses TeamCity
I'm using a selfhosted TC as Referenceplatform, and use travis with another configuration.