Buildkite is a CI and build automation tool that combines the power of your own build infrastructure with the convenience of a managed, centralized web UI. Developed by buildkite
License: Commercial
Bitbucket is primarily a code repository hosting service with integrated CI/CD capabilities, focusing heavily on collaboration and project management through integration with Atlassian products. Buildkite, on the other hand, is a CI/CD platform that emphasizes speed and flexibility, offering powerful build capabilities across various environments.