Free CircleCI Alternatives
CircleCI is described as 'provides development teams the confidence to build, test, and deploy—quickly and consistently—across numerous platforms'. There are more than 25 alternatives to CircleCI for various platforms. The best alternative is Jenkins, which is both free and Open Source. Other great sites and apps similar to CircleCI are Buddy (Freemium), Travis CI (Freemium), Buildbot (Free, Open Source) and Drone.io (Freemium, Open Source).