The best alternatives to SurplusCI are CircleCI, Show Layer, and Sail CI. If these 3 options don't work for you, we've listed a few more alternatives below.
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"Show Layer" is Dribbble for full stack developers! The Layer Showcase lets you spin up instances of full-stack software to try it before installing it.
A cloud native and distributed continuous integration platform with unlimited concurrency as standard. Use Docker containers as tasks and only pay for the time they run.