Drone.io has great language support, a minimalistic user interface, and a number of database options. Builds are quick and include all branches, with a button for manually re-executing builds if needed.

The user interface also provides an easy means to configure continuous delivery, archive build artifacts, and send notifications. These are strengths over AppVeyor and Travis CI, which require cobbling together a solution using your own Amazon S3 account. Review collected by and hosted on G2.com.

There is no support for non-Linux platforms, and build tools are not very customizable. Build configuration is kept separate from your code, which can make things difficult when working in a large team, unless you restrict yourself to a single person with administrative privileges. Review collected by and hosted on G2.com.