Automad

A File-Based & Open Source Content Management System.

Technology: PHP

Templating: Built in

Formatting: Markdown

Open source: yes

Website: http://automad.org/

Latest: http://automad.org/release-notes

Baun

A modern, lightweight, extensible CMS for PHP.

Technology: PHP

Templating: Twig

Formatting: Markdown

Open source: yes

Website: http://bauncms.com

Bludit

Create your own Blog in seconds, Fast, Simple, Extensible and Flat-file CMS.

Technology: PHP / JSON

Templating: HTML5 / Css / JavaScript

Formatting: Markdown and HTML

Open source: Yes

Website: http://www.bludit.com

Latest: 0.5 2015-11-01 http://forum.bludit.com/

Dodger CMS

DodgerCMS is a static markdown CMS built on top of Amazon S3.

Technology: JavaScript

Templating: PureCss

Formatting: Markdown

Open source: yes

Website: http://dodgercms.com/

Dropplets

Dropplets is a minimalist, databaseless Markdown blogging platform.

Technology: PHP

Templating: ??

Formatting: Markdown

Open source: yes

Website: http://dropplets.com/

Fansoro

Fansoro is Modern Open Source File-Based Content Management System.

Technology: PHP

Templating: Fenom

Formatting: Markdown

Open source: yes

Website: http://fansoro.org

Feindura

Flat File CMS for designers

Technology: PHP

Templating: PHP

Formatting: HTML / Text / Markdown

Open source: yes

Website: http://feindura.org/

Flat Press

FlatPress is a blogging engine that saves your posts as simple text files.

Technology: PHP

Templating: Smarty

Formatting: Text

Open source: yes

Website: http://flatpress.org/home/

Flot

no database CMS, written in PHP, supports themes, soon plugins, and flexible taxonomies (data types). Hybrid static/dynamic CMS that’s cached by default. Runs on anything with PHP. Still being developed, but has a good base of features.

Technology: PHP

Templating: HTML (optionally, add PHP)

Formatting: HTML with WYSIWYG editor

Open source: yes

Website: https://github.com/samthomson/flot/

Get Simple CMS

GetSimple is an XML based, stand-a-alone, fully independant and lite Content Management System.

Technology: PHP / XML

Templating: HTML, PHP

Formatting: HTML / WYSIWYG editor

Open source: yes

Website: http://get-simple.info/

Grav

In a nutshell, installing Grav is a matter of unzipping the file. It is fast, has sophisticated caching, and a light footprint for optimal performance.

Technology: PHP / YAML

Templating: Twig

Formatting: Markdown

Open source: yes

Website: http://getgrav.org/

Hexo

A fast simple, blog and framework

Technology: Node

Templating: Jade

Formatting: Markdown

Open source: yes

Website: https://hexo.io/

Herbie

Herbie is a CMS and blog system based on simple text files. Composer support - simple installation - no database - just text files.

Technology: PHP / YAML / Symfony Components

Templating: Twig

Formatting: Markdown / Textile

Open source: yes

Website: http://getherbie.org/

HTMLy

HTMLy is an open source databaseless blogging platform that prioritizes simplicity and speed (Flat-File Blog). HTMLy can be referred to as a Flat-File CMS, since it will also manage your content.

You do not need to use a VPS to run HTMLy, shared hosting or even free hosting should work as long as the host supports at least PHP 5.3.

Technology: PHP

Templating: ???

Formatting: Markdown

Open source: yes

Website: https://demo.htmly.com/

Hugo

Hugo is a general-purpose website framework. Technically speaking, Hugo is a static site generator.

Technology: Go

Templating: Go Templates

Formatting: Markdown

Open source: yes

Website: http://gohugo.io/

Jekyll

Transform your plain text into static websites and blogs.

Technology: Ruby

Templating: Liquid

Formatting: Markdown

Open source: yes

Website: http://jekyllrb.com/

Kirby

Kirby is a file-based CMS. Easy to setup, easy to use, flexible as hell

Technology: PHP

Templating: Roll your own

Formatting: Markdown

Open source: yes

Website: http://getkirby.com/

MetalSmith

An extremely simple, pluggable static site generator

Technology: Node

Templating: Unopinionated

Formatting: Markdown

Open source: yes

Website: http://www.metalsmith.io/

Mecha

Mecha is a file–based CMS. It does not require any database. Almost all files are stored as plain text files which grouped into folders, which you can even edit it manually through a plain text editor application.

Technology: PHP

Templating: PHP

Formatting: Markdown / Markdown Extra / HTML

Open source: yes

Website: http://mecha-cms.com/

Monstra

An entirely new kind of CMS. Pack up your content, markup, and style. Leave the database behind. Making websites just got fun again.

Technology: PHP

Templating: Built in

Formatting: Markdown / HTML

Open source: yes

Website: http://monstra.org

Mozilo

Simple, lightweight, beginner-friendly and expandable with plugins

Technology: PHP

Templating: HTML

Formatting: Expandable own syntax

Open source: yes

Website: http://mozilo.de/

Latest: 2.0.33 2015-05-18 https://github.com/mozilo/mozilo2.0/commits/master

Middleman

Middleman is a static site generator using all the shortcuts and tools in modern web development

Technology: Ruby

Templating: Multiple

Formatting: Markdown

Open source: yes

Website: http://middlemanapp.com/

Nanote

Nanote simple flat-file blog script, GPL v.3

Technology: PHP

Templating: HTML

Formatting: HTML

Open source: yes

Nesta

A Ruby CMS for developers and designers. With simple code that’s easy to follow, Nesta is easily extended using the Sinatra web framework.

Technology: Ruby / Sinatra

Templating: Haml, Erb, Erubis, Liquid, Sass, Scss and Less

Formatting: Markdown, Textile or Haml

Open source: yes

Website: http://nestacms.com/

Nibbleblog

Easy, fast and free Blog system

Technology: PHP

Templating: PHP

Open source: Yes

Website: http://www.nibbleblog.com/

Latest: 4.03 2014-04-01 http://blog.nibbleblog.com/post/nibbleblog-v4.0.3-coffee/

Parvula

Simple CMS for developers, designers and clients with admininistration panel.

Technology: PHP

Templating: PHP

Formatting: Markdown (html if needed)

Open source: yes

Website: https://github.com/BafS/parvula

PluXML

PluXML is a free, open-source, self-hosted CMS platform where data are stored by using XML files. This system is used to be a blog one, but pages feature allows to code some php inside the backend. Many plugins extend its functionnalities.

Technology: PHP / XML

Templating: PHP

Formatting: HTML, Text

Open source: yes

Website: http://www.pluxml.org/

Phile CMS

A Markdown File Based CMS

Technology: PHP

Templating: Twig

Formatting: Markdown

Open source: yes

Website: http://philecms.github.io/Phile/

Pico

A stupidly simple & blazing fast, flat file CMS.

Technology: PHP

Templating: Twig

Formatting: Markdown

Open source: yes

Website: http://pico.dev7studios.com/index.html

Pluck CMS

Small, Simple Content Managment

Technology: PHP

Templating: PHP

Open source: yes

Website: http://www.pluck-cms.org/

Latest: 4.7.3 2014-12-08 https://github.com/pluck-cms/pluck/releases

Pulse CMS

Flat file CMS

Technology: PHP

Templating: PHP

Formatting: HTML and Markdown

Open source: no

Website: http://www.pulsecms.com/

Latest: 4.5 2015-09-13 http://www.pulsecms.com/blog

Puppy CMS

puppyCMS - flat file, responsive, seo-friendly, lightweight and tiny CMS.

Technology: PHP

Templating: PHP

Formatting: HTML and Markdown

Open source: yes

Website: http://puppycms.com

Latest: 1.6 http://puppycms.com/download

Razor CMS

razorCMS is a File Based Content Management System. All data in razorCMS is stored in flat files, and uses a “database” engine called razorDB.

Technology: PHP

Templating: ???

Formatting: Text

Open source: yes

Website: http://www.razorcms.co.uk/

Singularity

A CMS in a Single PHP File

Technology: PHP

Templating: Nil

Formatting: Markdown

Open source: yes

Website: http://christophersu.net/2012/singularity-cms-single-php-file/

Statamic

An entirely new kind of CMS. Pack up your content, markup, and style. Leave the database behind. Making websites just got fun again.

Technology: PHP

Templating: Built in

Formatting: Markdown, Textile, HTML, Plain Text

Open source: no

Website: http://statamic.com/

Sphido

Sphido is a rocket fast, simple, lightweight, easy to hack, flat file CMS for PHP. Supports Markdown and HTML content with Latte template engine.

Technology: PHP

Templating: Latte / PHTML

Formatting: Latte / Markdown / HTML

Open source: yes

Website: http://www.sphido.org/

Typesetter

An Open source CMS written in PHP focused on ease of use with true WYSIWYG editing and flat-file storage.

Technology: PHP

Templating: PHP

Formatting: HTML / plain text

Open source: yes

Website: http://www.typesettercms.com

Urubu

A micro CMS for static websites

Technology: Python

Templating: Jinja

Formatting: Markdown

Open source: yes

Website: http://urubu.jandecaluwe.com/

Vodka

Simple and tiny PHP flat-file site engine.

Technology: PHP

Templating: HTML / PHP

Formatting: HTML

Open source: yes

Wintersmith

Flexible, minimalistic, multi-platform static site generator built on top of node.js.

Technology: Node.js

Templating: Jade

Formatting: Markdown

Open source: yes

Website: http://wintersmith.io/

WonderCMS

WonderCMS is a simple, secure flat file CMS

Technology: PHP and jQuery

Templating: PHP

Formatting: HTML

Open source: yes

Website: http://wondercms.com/

Yellow

Yellow is for people who make websites.

Technology: PHP

Templating: HTML / PHP

Formatting: Markdown

Open source: yes

Website: http://datenstrom.se/yellow/

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via Flat File CMS Systems
https://github.com/ahadb/flat-file-cms/blob/master/README.md