Our continuous integration infrastructure includes Buildbot, Travis CI, AppVeyor, and a nightly cron job.
Automatically builds and tests master and active release branches on every push (with a 5-minute stability timer). Doesn't currently build pull requests. Periodically does a Coverity Scan build.
Builds and tests all active branches and pull requests. Use
[ci skip] in a commit message to request that Travis skip that commit.
Build and tests all active branches and pull requests under Windows.
We run a nightly cron job on two machines (one Linux, one Solaris) which builds a snapshot and reports success or failure. We now have a Solaris buildbot worker, so we can probably decommission the nightly build infrastructure.