ImageSite - eQuorum’s ImageSite is an easy-to-use, single source document management system
Abstract - A secure, version-controlled hub for your design files
Helix Core - Helix Core is a scalable version control that securely manages all of your digital content and delivers files quickly to large, distributed teams.
Kactus - Design version control without changing your tools
AWS CodeCommit - AWS CodeCommit is a fully-managed source control service that makes it easy for companies to host secure private Git repositories.
Git Sketch Plugin - Version control for designers