Developed on the basis of Git version control system, GitLab is one of the best web platforms for hosting project source codes. Although GitLab is similar to GitHub in terms of functionality, it seems to be a better choice for teamwork than its famous counterpart and GitLab features may be different somewhat.GitLab exists in two forms. The first one is SAAS - website with open registration, and the second one is an individual solution GitLab Community Edition. They both can be perfectly customized to any service.
Read also about GitLab pros and cons in the article GitHub vs BitBucket vs GitLab: Developers' Research