DevOps CI/CD Tool 20年史 2004-2026。CruiseControl (2001 ThoughtWorks・初CI Tool・Java)・Hudson (2004年2月 Kohsuke Kawaguchi 川口耕介 Sun Microsystems・Java OSS)→Oracle 2010年買収後Fork→Jenkins (2011年2月 Hudson Fork・Kohsuke独立・LF Project・Plugin 1700+・Master-Slave Architecture)・Bamboo (2007 Atlassian)・TeamCity (2006 JetBrains・Free Tier+Pro)・GitLab CI/CD (2015 GitLab.com Bundle・YAML Pipeline・Runner Self-host)・Travis CI (2011 Github連携・FREE OSS→2018年プライベート有料化炎上→GitHub Actions流出)・CircleCI (2011 Cloud-native CI)・Drone CI (2013 OSS Container-native→Harness 2020年買収)・Concourse (2014 Pivotal→VMware→OSS)・Buildkite (2012 Australia)・Semaphore CI (2012)・GitHub Actions (2018年10月 announce→2019年11月Beta→2020年4月GA・YAML Workflow・Marketplace 20000+ Action・Free Public+Pro Private)・Bitbucket Pipelines (Atlassian 2016)・AWS CodePipeline+CodeBuild+CodeDeploy (2015-)・Azure DevOps→旧VSTS→Azure Pipelines (2018)・Google Cloud Build (2018)・Argo CD GitOps (2018 Intuit→CNCF Graduated 2022)・FluxCD GitOps (2016 Weaveworks→CNCF)・Spinnaker (2015 Netflix・Multi-Cloud CD)・Tekton CD (CDF 2019)・Dagger (2022 Solomon Hykes Docker元)・Earthly (2020 Build自動化)・Buildah+Kaniko (Image Build sans Docker daemon)・Container Registry: Docker Hub+GHCR+ECR+GCR・SAST: SonarQube+Snyk+Dependabot+Renovate Bot・Test: Jest+Vitest+Playwright Testing in CI・¥0 OSS-¥¥¥¥¥/User 月 2026 GitHub Actions+GitLab CI主流。