Netlify CMS is an open source tool brought to you by the folks at Netlify. It is probably the most unique one of this list because unlike all of the others, this week or last, Netlify CMS isn’t API-based, it is Git-based. Instead of having a database, it reads from and writes to a Git repository. Originally it only supported Github, but I believe Bitbucket and Gitlab are also supported now. You simply add a couple of files to your static site, exposing an /admin/ URL where the CMS lives and it loads up content from a preconfigured repository. These files are typically Markdown based with front-matter. Once you finish working on your content you save/commit back to your repository. At that point if you are using Netlify hosting, your site would be rebuilt and redeployed. It even supports an editorial workflow based on pull requests.