Forestry
Decap CMS
Cloud Cannon
Hosted.MD
Contentful
Sanity.io
Netlify
Stackbit
SourceForge
GitHub
GitLab
BitBucket
openDesktop.org
Gitea
Launchpad.net
OSOR
Forestry
SourceForgeDecap CMS - Open source content management for your Git workflow
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
Cloud Cannon - Cloud Cannon turns Dropbox/Git-project into a CMS you can setup in seconds
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Hosted.MD - With hosted.md, you can publish Markdown online without setting up servers, configuring a CMS, or dealing with complicated tools.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.