Yes, both Semaphore and GitLab offer a Free Trial.
Semaphore is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
GitLab is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Semaphore Starts at $20/Month whereas for GitLab Starts at $19/User/Month.
Some top alternatives to Semaphore includes Clustered Cloud, Codeship, GitLab, CircleCI, Bamboo, AutoRABIT CI, Buildkite, Travis CI, Codefresh and CloudQA.
Some top alternatives to GitLab includes Codeship, Semaphore, CircleCI, Bamboo, AutoRABIT CI, Buildkite, CloudBees Core, Travis CI and Bitbucket.