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[2014 users on Ohloh]
GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring.

It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.

GIMP is expandable and extensible. It is designed to be augmented with plu...

[781 users on Ohloh]
Inkscape is a drawing tool with capabilities similar to Illustrator, Freehand, and CorelDraw that uses the W3C standard scalable vector graphics format (SVG). The supported SVG features include basic shapes, paths, text, markers, clones, alpha blending, transforms, gradients, and grouping. In addition, it supports Creative Commons meta-data, node-editing, layers, complex path operations, text-on-path, and SVG XML editing. It also imports several formats like EPS, Postscript, JPEG, PNG, BMP, and ...
Drupal (core)
[412 users on Ohloh]
Drupal is an open source content management platform, allowing an individual or a community of users to easily publish, manage and organize a great variety of content on a website.

Equipped with a powerful blend of features, Drupal is able to support community sites, blogs, portals and more.

This is Drupal's core, you can find the contributed modules page at http://ohloh.net/projects/3502.

[378 users on Ohloh]
phpBB is a UBB-style dissussion board written in PHP. It includes features such as posting/replying/editing messages, private messages, private forums, user and anonymous posting, robust theming, user ranking by posts or by special, admin definable, ranks, and much more. phpBB supports 8 different SQL backends, not just MySQL, SQLite, PostgreSQL, Firebird, ODBC and a few others...
[311 users on Ohloh]
Joomla! is one of the most powerful Open Source Content Management Systems on the planet. It is used all over the world for everything from simple websites to complex corporate applications. Joomla! is easy to install, simple to manage, and reliable..
[219 users on Ohloh]
Smarty is a template engine for PHP. More specifically, it facilitates a manageable way to separate application logic and content from its presentation.
[189 users on Ohloh]
Dia is inspired by the commercial Windows program 'Visio', though more geared towards informal diagrams for casual use. It can be used to draw many different kinds of diagrams. It currently has special objects to help draw entity relationship diagrams, UML diagrams, flowcharts, network diagrams, and many other diagrams. It is also possible to add support for new shapes by writing simple XML files, using a subset of SVG to draw the shape.

It can load and save diagrams to a custom XML format...

[137 users on Ohloh]
jEdit is an Open Source text editor written in Java. It has many useful features, such as syntax highlighting, bracket matching, regular expression searching, multiple file search and replace, folding, and keyboard macros. jEdit also includes a powerful plugin architecture that allows more than 80 plugins to be downloaded and installed from within the editor.
RoundCube Webmail
[120 users on Ohloh]
RoundCube Webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation, message searching and spell checking. RoundCube Webmail is written in PHP and requires a MySQL or Postgres database. The user interface is fully skinnable using XHTML and CSS 2.
[88 users on Ohloh]
Scribus is a desktop page layout program with the aim of producing commercial grade output in PDF and Postscript.
[73 users on Ohloh]
Fluxbox is a lightweight and highly configurable window manager with pwm-like tabs.
[66 users on Ohloh]
ArgoUML is the leading open source UML modeling tool and includes support for all standard UML 1.4 diagrams. It runs on any Java platform and is available in ten languages.

ArgoUML was installed half a million times during 2005 and is in use all over the world.

Umbrello UML Modeller
[58 users on Ohloh]
Umbrello UML Modeller is a Unified Modelling Language diagram tool for KDE. It is able to produce all types of UML diagrams and uses an XMI-based file format. It imports and generates code in a couple of languages.

Umbrello is part of KDE's kdesdk module.

[45 users on Ohloh]
A JavaServer Faces specific view-technology that combines the ease of Tapestry-like components with the familiar syntax of JSP within valid XML-syntax and EL use. Incorporating custom UIComponents is extremely easy, including being able to define Component trees in other files. Additional features include a high performance templating framework that makes composing JSF pages extremely simple.
SilverStripe CMS
[43 users on Ohloh]
SilverStripe is a CMS and application framework based on PHP5 / MySQL that powers your medium-sized website.

- Friendly flexible back-end out of the box
- Complete design/template freedom
- Productive object oriented coding framework (PHP5 only)
- Open Source! :)
- Works with the Web 2.0 rather than fighting it (supports APIs rather than having a module for everything)
- Good at web standards and search-engine ranking

[41 users on Ohloh]
MyFaces is the first free implementation of Suns new JavaServer (tm) Faces (aka JSF). See http://java.sun.com/j2ee/javaserverfaces for more information.
[40 users on Ohloh]
Mason is a powerful Perl-based web site development and delivery engine. With Mason you can embed Perl code in your HTML and construct pages from shared, reusable components.

Mason solves the common problems of site development: caching, debugging, templating, maintaining development and production sites, and more.

Mason is 100% free and open source. Although it can be used from CGI or even stand-alone, it is optimally designed for use with two other open source technologies: mod_per...

DDD - Data Display Debugger
[34 users on Ohloh]
GNU DDD, the Data Display Debugger, is a GUI to command-line debuggers like GDB, DBX, JDB, XDB, Ladebug, WDB, the Perl debugger, or the Python debugger. It provides a graphical data display where complex data structures can be explored incrementally and interactively.
XOOPS Dynamic Web CMS
[34 users on Ohloh]
XOOPS is a dynamic OO (Object Oriented) portal script written in PHP. It supports mySQL, and is an ideal tool for developing small to large dynamic community Web sites, intra-company portals, corporate portals, Web logs, and much more.
[33 users on Ohloh]
Smultron is a free text editor for Mac OS X 10.4 Tiger which is both easy to use and powerful. It is designed to not confuse newcomers nor disappoint advanced users. It has all the advantages of an Cocoa application and some of its features are tabs, line numbers, support for syntax colouring for many different languages, functions list, support for text encodings, snippets, a toolbar, a status bar, preview, split window, multi-document find and replace with regular expressions, possibility to s...