Luckily GitHub is supported so that I can maintain my projects on my account, but my company uses Gitlab, and from what I can see Gitlab isn't currently supported. For now, I can only use SourceTree for personal use because of this, but I would really like to use it for my company. If Gitlab becomes supported, I will be able to uninstall the other Git client I use (SmartGit) and solely use SourceTree as the Git client for both personal and company-related projects.