Coolify is an open-source self-hosted PaaS from the Hungarian team coolLabs that deploys apps and databases with one click; 491,197+ self-hosted instances run 280+ one-click services.
Semaphore CI is a cloud CI/CD platform founded in 2012 in San Francisco, USA, known for being 10x faster with Docker-native builds and parallel testing.
Buildkite is a hybrid CI/CD platform founded in Australia in 2013, letting 3000+ teams run builds on their own infrastructure with self-hosted agents plus cloud orchestration, balancing flexibility, security and low ops.