Yes, both Buildkite and Travis CI offer a Free Trial.
Buildkite is designed for Large Enterprises, Medium Business and Small Business.
Travis CI is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Buildkite Starts at $2,999/User/Month whereas for Travis CI Starts at $69/Month.
Some top alternatives to Buildkite includes Codeship, GitLab, CircleCI, Bamboo, AutoRABIT CI, CloudBees Core, Travis CI, AppVeyor and Drone.io.
Some top alternatives to Travis CI includes Codeship, Semaphore, GitLab, CircleCI, Bamboo, Buildkite, CloudBees Core, AppVeyor and GitlabRunner.