What is CMS.js?
CMS.js is fully client-side, Javascript site generator in the spirit of Jekyll that uses plain ol' HTML, CSS and Javascript to generate your website. It takes your content, renders Markdown and delivers a complete website in Single-Page App fashion...without the aid of server-side scripting (no Node.js, PHP, Ruby, etc.).

https://www.flatfilecmslist.com/cms/
https://github.com/ahadb/flat-file-cms/
http://trendschau.net/blog/uebersicht-flat-file-cms/
http://www.hongkiat.com/blog/flat-cms/

• Pico: http://picocms.org/ | Portfolio Theme, Plugins , MD
• Yellow: http://datenstrom.se/yellow/ | Editor, Plugins + Themes
• baun: https://bauncms.com/ | MD, Editor, Twig Templates
• Automad: http://automad.org/ | Portfolio Theme, Editor, MD

• Typesetter: http://www.typesettercms.com/ | Editor, viele Plugins + Themes

• Grav: https://getgrav.org/ | MD , Plugins + Themes, Videoplugin
• Flextype: http://flextype.org/ | (Monstra+Fansoro) Videoplugin + Themes
• HTMLy: https://www.htmly.com/ | eher für Blogs
• Typemill: http://typemill.net/ | MD, schlank, eher für Textseiten
• CMSuno: https://github.com/boiteasite/cmsuno | Editor, für Onepager
• CMSimple: https://www.cmsimple.org/ | Video+Kalender-Plugins, altbacken
• WonderCMS: https://www.wondercms.com/ | Onscreen-Editor
• Nibbleblog: http://www.nibbleblog.com/ | eher für Blogs
• Sitemagic CMS: https://sitemagic.org/ | Editor, bloaty
• Blozilla: http://www.blozilla.com | Editor, Backplane
• BootPress: https://www.bootpress.org/ | Bootstrap based, nicht trivial
• Novius OS: http://www.novius-os.org/

• Microweber: https://microweber.com/ sehr groß!

• Mecha: http://mecha-cms.com/ | keine Demo

  COMMANDLINE INSTALLATION:

• Hugo: http://gohugo.io/
• Parvula: https://parvulacms.github.io/
• Postleaf: https://www.postleaf.org/
• Radiant: http://radiantcms.org/
• Middleman: https://middlemanapp.com/
• Apostrophe: http://apostrophecms.org/
• Herbie: https://www.getherbie.org/ | zu simpel, Plugins per cl

NOT FLAT, but worth a look:

• ElefantCMS: https://www.elefantcms.com/
• Pagekit: https://pagekit.com/ | Editor, Portfolio Theme
• Koken: http://koken.me/
• Secretary: http://secretarycms.com/
• Rexo: http://rexo.ch/ | zu komplex

modern HTTP web server index for Apache httpd, lighttpd, nginx and Cherokee