Top 25 Projects:

1. PostBooks ERP, accounting, CRM by xTuple
Free open source ERP, accounting, CRM package for small to midsized businesses. Runs on Linux, Mac, and Windows (built with open source Qt framework). Business logic resides in PostgreSQL database. Rich API for connecting to third-party apps.

2. 7-Zip
7-Zip is a file archiver with the high compression ratio. The program supports 7z, XZ, BZIP2, GZIP, TAR, ZIP, WIM, ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR, Z.

3. phpMyAdmin
phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web. Currently it can create and drop databases, create/drop/alter tables, delete/edit/add fields, execute any SQL statement, manage keys on fields.

4. Arianne RPG
Arianne is a multiplayer online engine to develop turn based and real time games providing a simple way of creating the game server rules and clients like Stendhal. Our engine Marauroa uses Java and SQL for hosting hundreds of players on a solo host.

5. KeePass Password Safe
KeePass Password Safe is a free, open source, light-weight and easy-to-use password manager for Windows. You can store your passwords in a highly-encrypted database, which is locked with one master password or key file.

6. Openbravo ERP
Openbravo ERP is the web-based ERP for SMEs. Available as a professional open source ERP solution, Openbravo ERP provides unique high-impact benefits: 1) Comprehensive 2) Innovative 3) Cost effective. | IMPORTANT NOTICE. Openbravo ERP project communi

7. ADempiere ERP Business Suite
ADempiere Business Suite ERP/CRM/MFG/SCM/POS done the Bazaar way in an open and unabated fashion. Focus is on the Community that includes Subject Matter Specialists, Implementors and End-Users. We forked and survived Compiere which is now closed.

8. FreeCol
FreeCol is an open version of Colonization. It is a Civilization-like game in which the player has to conquer the new world.

9. OpenXava
Framework for Rapid Development of AJAX JavaEE / J2EE applications. Allows to define applications just with POJO , JPA and Java annotations. Feature rich and flexible. Generates JSR-168 portlet applications for Liferay , WebSphere Portal , Jetspeed

10. ffdshow
ffdshow is an advanced DirectShow filter and VFW codec that supports many audio and video formats. For example: H.264, MPEG-4, MPEG-2, H.263, VP3, VP6, Theora, MJPEG, SVQ3, MP3, AC3, DTS, E-AC3, AAC, and Vorbis.

11. ZK – Simply Ajax and Mobile
ZK is Ajax Java framework. With direct RIA, 200+ Ajax components and a markup language, developing Ajax/RIA as simple as desktop apps and HTML/XUL pages. Support JSP/JSF/JavaEE/Spring., Ajax Push, and Ajax script in Java/Ruby/Groovy/Python/JavaScript

12. TCPDF – PHP class for PDF
TCPDF is a PHP class for generating PDF documents without requiring external extensions. TCPDF Supports UTF-8, Unicode, RTL languages, XHTML, Javascript, digital signatures, barcodes and much more.

13. Notepad++
Notepad++, a source code editor and MS Windows Notepad replacement, has the mission to offer a greener environment. By optimizing its routines, it results in reducing CPU power consumption then reducing the world carbon dioxide emissions.

14. DVDStyler
DVDStyler is a cross-platform free DVD authoring application for the creation of professional-looking DVDs. It allows not only burning of video files on DVD that can be played on standalone DVD player, but also creation of individually designed DVD menus

15. Webmin
A web-based system administration tool for Unix servers and services.

16. Task Coach
Task Coach – Your friendly task manager. Task Coach is a simple open source todo manager to manage personal tasks and todo lists. Often, tasks and other things todo consist of several activities. Task Coach is designed to deal with composite tasks.

17. GpsMid
Java Midlet to use OpenStreetMap data on a J2ME ready Mobile. Displays a moving map using external or internal GPS, shows the street name on which you are. There is Navigation support for car drivers, bicyclists and pedestrians plus many more …

18. Password Safe
Password Safe is a password database utility. Users can keep their passwords securely encrypted on their computers. A single Safe Combination unlocks them all.

19. Greenshot
Revolutionary screenshot tool optimized for productivity. Save a screenshot or a part of the screen to a file within a second. Apply text and shapes to the screenshot. Offers capture of window, region or full screenshot. Supports several image format

20. MinGW – Minimalist GNU for Windows
MinGW: A native Windows port of the GNU Compiler Collection (GCC), with freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality.

21. Mobile Atlas Creator
This application creates off-line atlases of raster maps for various cell phone apps on Android, iPhone and WindowsCE as well as GPS devices (Garmin, Magellan and others)

22. DavMail POP/IMAP/SMTP/Caldav to Exchange
Ever wanted to get rid of Outlook ? DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP gateway allowing users to use any mail client with Exchange, even from the internet through Outlook Web Access on any platform, tested on MacOSX, Linux and Windows

23. JMRI Model Railroad Interface
Java interfaces and sample implementations for controlling a model railroad layout from a personal computer. JMRI is intended as a jumping-off point for hobbyists to build their own layout controls. Includes the DecoderPro and PanelPro applications.

24. Clonezilla
Clonezilla is a partition or disk clone tool similar to Norton Ghost®. It saves and restores only used blocks in hard drive. Two types of Clonezilla are available, Clonezilla live and Clonezilla SE (Server Edition).

25. Zenoss Core – Enterprise IT Monitoring
Zenoss Core is an enterprise network and systems management application written in Python. Zenoss provides an integrated product for monitoring availability, performance, events and configuration across layers and across platforms.