Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Gitea - A painless self-hosted Git service
Invision - Prototyping and collaboration for design teams
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Sketch - Professional digital design for Mac.
GitBucket - GitBucket is the easily installable open-source GitHub clone written with Scala.