If you're looking for alternatives to Git, consider Bitbucket, GitLab, Apache Subversion (SVN), Mercurial, AWS CodeCommit, Gitea, Gogs, Sourcetree, GitKraken, or Helix Core.
Here's a more detailed breakdown:
Version Control Systems (Similar to Git):

Mercurial:
A distributed version control system, similar to Git, known for its simplicity and ease of use.

Apache Subversion (SVN):
A centralized version control system, where a single server stores the project's history, and developers check out and check in changes from that server.

Git Hosting Platforms (Alternatives to GitHub):

Bitbucket:
A popular alternative, particularly for teams using other Atlassian products like Jira and Confluence, offering free private repositories for small teams and supporting both Git and Mercurial.

GitLab:
A comprehensive platform that offers Git repository hosting, CI/CD, and other DevOps tools, making it a strong alternative to GitHub.
AWS CodeCommit:
A fully managed source control service within the AWS ecosystem, allowing teams to host Git repositories securely and scalably.