Lite is the description OpenSourceCMS.com uses to refer to a Portal/CMS that does not require a database to function. These systems are very easy to install, but generally lack the sophistication of a database driven content management system.

GetSimple is an XML based lite Content Management System. To go along with it's best-in-class user interface, we have loaded it with features that every website needs, but with nothing it doesn't.

gpEasy is a complete content management system that lets users create rich and flexible Web sites with a simple and easy-to-use interface. The embedded design of the admin interface allows users to instantly see changes in a single browser window.

Pluck is a CMS written in PHP, that aims to be as simple as possible. With pluck you can easily manage your own website without knowledge of programming languages. This makes pluck an excellent choice for every small website.

OneFileCMS is just that. It's a flat, light, one file CMS (Content Management System) entirely contained in an easy-to-implement, highly customizable, database-less PHP script.

WonderCMS is the smallest flat file CMS. It's simple and intuitive.
Editing content is easy - clicking on the content will enable you to edit it, and clicking out will save the content.

LightNEasy is not only a CMS, It actually creates plain, pure web pages for your whole website, making it SEO friendly and fast loading. Each time you add a page, alter the menus, it regenerates all pages again so that they remain fully integrated.

FlatNuke3 is a CMS (Content Management System) that makes no use of DBMS, but only text files (so its name).

CMSQLite is a free and open source CMS. It's based on PHP and SQlite data base (MySQL version also available).
CMSQLite is perfect for single users, small sites, small companies, associations etc...
CMSQLite is simple, extendible, flexible and complete.

Webmedia Explorer is the alternative CMS engine that reads the hard disc and generates a website realtime taking advantage of a very powerful rendering and data fetching caching system. It's your web desktop, a mediablog, a very abstract portal...

Really simple content management; no database, no frills. Embed editable nuggetz into your website with one line of php. Rewritten with JQuery and TinyMCE.

CMSimple is simple, small and smart.
It does not need a database as it writes all data directly to a HTML file. This simplifies installation, maintenance, and backup.
CMSimple is extensible and offers a wide variety of templates and plug-ins.

Template CMS — fast and lightweight content management system, which allows you to easily create a promo site, satellite, personal page of a person who has no experience in PHP or HTML.

feindura is a Open Source Flat File based Content Management System ideal for small websites and with a nice interface!
It gives you all the flexibility you need when creating awesome web sites.

log1 CMS is no data base content managment system written in PHP, very simple to install and use. Allows to create one level menu web page in 5 simple steps.
+ drag and drop feature, TinyMCE WYSWIG editor, RSS2 feed, search engine, image gallery.

SkyBlueCanvas Lightweight CMS is an open source, free content management system written in php and built specifically for small web sites. Simply upload the software to your web server, and you are ready to start adding text and pictures to your web site.

Free, simple to use and easy to modify CMS script. Minimal requirements: PHP 5.2 +, 2 MB disk space and 5 free minutes to install! Doesn't need MySQL or any changes in Apache.
Advantages: great Google results, very good performance and ...

Easy, customizable, flat-file, content management system (CMS). It uses only text files and will run on any server where basic PHP5 fread()/fwrite() exist. Includes module system, easy templating (any layout can be integrated), WYSIWYG editor and more!

easyCMSlite is a free, easy content management system (CMS). If you have no or little experience, time or budget but need to get a site up quickly and easily, then try out easyCMSlite, the free, easy content management system!

RuubikCMS is a lightweight website publishing tool which is designed to be user-friendly for both the end-user and the webmaster. It is also fast and very easy to install as it uses SQLite database engine that comes built in PHP 5.1 and above.

Onpub is a mobile device-friendly Web content management system (CMS). It enables online publishing of custom, dynamic websites with a collection of flexible web apps and scripts.

CMSimple_XH is a fast, small, easy-to-use and easy-to-install, modular Content Management System (CMS) that works without a database.

99ko is a CMS to create a website in minutes and without any programming knowledge. It works without a database and uses text files in JSON format to store your data.

Stash — content management system (CMS). Was written on PHP and uses MySQL. Distributed under The Creative Commons License.

WinterBreath is a simple Content Management System (CMS) written for PHP designed to provide ability to create new simple website easily, quickly a reliably.
WinterBreath is a lightweight CMS designed only for small personal homepages.

The Webutler is a small system to edit static HTML pages in your browser.

Easily Build Super-Fast Static Websites!
Static-CMS is a ruby gem for creating simple static websites in minutes.