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Mozilla Firefox
[5807 users on Ohloh]
The award-winning Web browser is now faster, more secure, and fully customizable to your online life. With more than 15,000 improvements, Firefox 3 is faster, safer and smarter than ever before.

If you stack this project, you should also stack the Mozilla Core.

[3893 users on Ohloh]
MySQL, the most popular Open Source SQL database management system, is developed, distributed, and supported by Sun Microsystems.
GCC, the GNU Compiler Collection
[2157 users on Ohloh]
The GNU Compiler Collection includes front ends for C, C++, Objective-C, Fortran, Java, and Ada, as well as libraries for these languages (libstdc++, libgcj,...).
[1814 users on Ohloh]
TortoiseSVN is a very easy to use SCM / source control software for Microsoft Windows. It is implemented as a Windows shell extension, which makes it integrate seamlessly into the Windows explorer. Since it's not an integration for a specific IDE you can use it with whatever development tools you like.
[770 users on Ohloh]
Apache Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies.
Apache Ant
[751 users on Ohloh]
Apache Ant is a Java-based build tool. In theory, it is kind of like Make, but without Make's wrinkles.
[569 users on Ohloh]
log4j is a Java-based logging utility, and is one of many projects from the Apache Software Foundation. It is used primarily as a debugging tool.
[558 users on Ohloh]
Hibernate is a powerful, high performance object/relational persistence and query service for Java. It lets you develop persistent objects following common Java idiom, including composition, association, inheritance, polymorphism, and the Java collections framework. To allow a rapid build procedure, Hibernate rejects the use of code generation or bytecode processing. Instead, runtime reflection is used and SQL generation occurs at system startup time. It supports Oracle, DB2, MySQL, PostgreSQL, ...
Eclipse Java Development Tools (JDT)
[537 users on Ohloh]
Tags: java eclipse ide
The JDT project provides the tool plug-ins that implement a Java IDE supporting the development of any Java application, including Eclipse plug-ins. It adds a Java project nature and Java perspective to the Eclipse Workbench as well as a number of views, editors, wizards, builders, and code merging and refactoring tools. The JDT project allows Eclipse to be a development environment for itself.
Maven 2
[537 users on Ohloh]
Maven is a software project management and comprehension tool. Based on the concept of a project object model (POM), Maven can manage a project's build, reporting and documentation from a central piece of information.
Spring Framework
[535 users on Ohloh]
Spring is a lightweight Java/J2EE application framework based on code published in "Expert One-on-One J2EE Design and Development" by Rod Johnson. It includes powerful JavaBeans-based configuration management applying Inversion-of-Control principles, a generic abstraction layer for transaction management allowing for pluggable transaction managers, a JDBC abstraction layer, integration with Hibernate, JDO, Apache OJB, and iBATIS SQL Maps, AOP functionality, and a flexible MVC Web application fra...
Eclipse Web Tools Platform (WTP)
[429 users on Ohloh]
The Eclipse Web Tools Platform (WTP) project extends the Eclipse platform with tools for developing Java EE and Web applications. The WTP project includes the following tools: source editors for HTML, JavaScript, CSS, JSP, SQL, XML, DTD, XSD, and WSDL; graphical editors for XSD and WSDL; Java EE project setup, builders, and models, Java EE contributions to the common navigators; a Web service wizard and explorer, and WS-I Test Tool.
NetBeans IDE
[355 users on Ohloh]
The NetBeans IDE is a free, open-source Integrated Development Environment for software developers. The IDE runs on many platforms including Windows, Linux, Solaris, and the MacOS. It is easy to install and use straight out of the box. The NetBeans IDE provides developers with all the tools they need to create professional cross-platform desktop, enterprise, web and mobile applications.
[349 users on Ohloh]
Doxygen is a documentation system for C++, C, Java, Objective-C, Python, IDL (Corba and Microsoft flavors) and to some extent PHP, C#, and D.

Doxygen is developed under Linux and Mac OS X, but is set-up to be highly portable. As a result, it runs on most other Unix flavors as well. Furthermore, executables for Windows are available.

Jetty - Java HTTP Servlet Server
[281 users on Ohloh]
Jetty is an Open Source HTTP Servlet Server written in Java. It is a full featured HTTP/1.1 server and a Servlet container. It is designed to be small, fast, embeddable and extensible. It supports HTTP/1.1, servlets 2.5, and JSP 2.1.
[215 users on Ohloh]
FindBugs is a defect detection tool for Java that uses static analysis to look for more than 200 bug patterns, such as null pointer dereferences, infinite recursive loops, bad uses of the Java libraries and deadlocks. FindBugs can identify hundreds of serious defects in large applications (typically about 1 defect per 1000-2000 lines of non-commenting source statements). FindBugs is open source, and has been downloaded more than 230,000 times, and is used by many major companies and financial in...
JBoss Application Server
[214 users on Ohloh]
JBoss Application Server is the #1 most widely used Java application server on the market. A J2EE certified platform for developing and deploying enterprise Java applications, Web applications, and Portals, JBoss Application Server provides the full range of J2EE 1.4 features as well as extended enterprise services including clustering, caching, and persistence.
Commons Collections
[209 users on Ohloh]
Tags: java library
An enhancement upon the Java Collections Framework. providing many more interfaces and implementations of useful collections. classes which are used to contain many other classes.
[205 users on Ohloh]
Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. Its purpose is to automate the process of checking Java code, and to spare humans of this task.
[195 users on Ohloh]
OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.

The suite includes:

* slapd - stand-alone LDAP daemon (server)
* slurpd - stand-alone LDAP update replication daemon
* libraries implementing the LDAP protocol, and
* utilities, tools, and sample clients.