env-ci
Get environment variables exposed by CI services
ci-env
Environment variables exposed by CI tools
travis-ci
node library to access the Travis-CI API
cross-ci
`cross-ci` standardizes environment variables for CI. For example, your can simply use `BUILD_BRANCH` variable in all CI runners instead of `CIRCLE_BRANCH` in CircleCI or `TRAVIS_PULL_REQUEST_BRANCH` in Travis.