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In general? Yes, Travis CI seems to be a very popular one. Many folks use Appveyor for Windows support AFAICT.

Rust uses https://github.com/rust-community/bors which maintains a linear queue of PRs which can only land after being rebased onto the commits before the PR and subsequently passing tests.

Swift also has a lot of pre-commit CI:

- here is the Jenkins bots page: https://ci.swift.org/view/Pull%20Request/ - example of PR test reporting: https://github.com/apple/swift/pull/6802

dlang uses several. One notable one is the "autotester" written by Brad Roberts. It's built to ensure that breaking the D compiler (as tested by the test suite) does not result in commits.

It's incredibly useful.