What are some alternatives to Abstract?

What is Abstract and what are its top alternatives?

Abstract builds upon and extends the stable technology of Git to host and manage your work.

Abstract is a tool in the Visual Version Control category of a tech stack.

TortoiseSVN
It is an Apache™ Subversion (SVN)® client, implemented as a Windows shell extension. It's intuitive and easy to use, since it doesn't require the Subversion command line client to run. And it is free to use, even in a commercial environment. ...
Folio
Folio is a simple version control app for designers. It lets you clean up all your duplicates by allowing you to browse and restore previous versions of your design documents. ...
Pixelapse
Pixelapse Is Where Your Designs Live Version Control + Backup + Collaboration ...
Gource
It is an OpenGL-based 3D visualisation tool for source control repositories. The repository is displayed as a tree where the root of the repository is the centre, directories are branches and files are leaves. Contributors to the source code appear and disappear as they contribute to specific files and directories. ...
LayerVault
One central LayerVault repository. Accessible to everyone, simplified, and organized without the effort. Whether using LayerVault Sync or Dropbox, we store and organize your design work. No desktop interface or command line. ...