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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...
[530 users on Ohloh]
Wine is an implementation of the Windows API on top of X and Unix. It does not require Microsoft Windows, but can use native Windows DLLs if they are available. It provides both a development toolkit for porting Windows source code to Unix as well as a program loader, allowing many unmodified Windows programs to run on x86-based Unixes.
Boost C++ Libraries
[217 users on Ohloh]
Boost was begun by members of the ISO C++ Standard committee Library Working Group to provide free peer-reviewed portable libraries to the C++ community. An additional objective is to establish "existing practice" and provide reference implementations so that the Boost libraries are suitable for eventual standardization.

Components successfully moved into draft ISO Standard C++09 include shared_ptr, regular expressions, function wrappers and binders.

[99 users on Ohloh]
Ehcache is a widely used java distributed cache for general purpose caching, J2EE and light-weight containers.

It features memory and disk stores, replicate by copy and invalidate, listeners, a gzip caching servlet filter and much more...

Ehcache is available under an Apache open source license and is actively developed, maintained and supported.

[82 users on Ohloh]
JFreeChart is a chart library for the Java platform that supports a wide range of charts including pie charts (2D and 3D), bar charts (horizontal and vertical, regular or stacked, with optional 3D-effects), line charts, XY plots, scatter plots, time series charts, high/low/open/close charts, candlestick plots, Gantt charts, Pareto charts, combination charts, and more. It is suitable for use in applications, applets, servlets, and JSP.
[72 users on Ohloh]
gnuplot plots 2d and 3d graphs, from a data file or with a formula. It has an interactive mode with online help, or it can be used non-interactively. gnuplot does function fitting to data sets, and it does output to many terminals, among which are PostScript, X11 display, PNG, and GIF (via the old gd library).
[69 users on Ohloh]
iText is a library that contains classes to generate documents in the Portable Document Format (PDF), XML, HTML, and RTF. It can also parse XML documents and convert them into any of these formats. Pages of existing PDF files can be imported and copied to new PDF documents.
dom4j: flexible XML framework for Java
[58 users on Ohloh]
dom4j is an easy to use, open source library for working with XML, XPath, and XSLT on the Java platform, using the Java Collections Framework, and with full support for DOM, SAX, and JAXP.
Saxon XSLT and XQuery Processor
[50 users on Ohloh]
The SAXON package is a collection of tools for processing XML documents.
[50 users on Ohloh]
Scintilla is a free source code editing component for Win32 and GTK+. As well as features found in standard text editing components, Scintilla includes features especially useful when editing and debugging source code. These include support for syntax styling, error indicators, code completion and call tips. Styling choices are more open than with many editors, allowing the use of proportional fonts, bold and italics, multiple foreground and background colours and multiple fonts.
[50 users on Ohloh]
SimpleTest is a unit tester, Web tester, and dynamic mock objects framework for PHP. The test structure is similar to JUnit/PHPUnit. Used as a Web tester, you can navigate sites and submit forms as if you were using a Web browser.
[43 users on Ohloh]
SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages. SWIG is primarily used with common scripting languages such as Perl, PHP, Python, Tcl/Tk, and Ruby, however the list of supported languages also includes non-scripting languages such as C#, Common Lisp (CLISP, Allegro CL, UFFI), Java, Modula-3, and OCAML. Also several interpreted and compiled Scheme implementations (Guile, MzScheme, Chicken) are supported. SWIG is m...
[24 users on Ohloh]
SVNKit is a pure Java Subversion library.

SVNKit provides programming API to access and manipulate Subversion working copies and Subversion repositories and includes SVNKit-based Subversion command line client.

[21 users on Ohloh]
Java Compiler Compiler is the most popular parser generator for use with Java applications. A parser generator is a tool that reads a grammar specification and converts it to a Java program that can recognize matches to the grammar. In addition to the parser generator itself, JavaCC provides other standard capabilities related to parser generation such as tree building (via a tool called JJTree included with JavaCC), actions, debugging, etc.
[16 users on Ohloh]
PD (aka Pure Data) is a real-time graphical programming environment for audio, video, and graphical processing. It is the third major branch of the family of patcher programming languages known as Max (Max/FTS, ISPW Max, Max/MSP, jMax, etc.) originally developed by Miller Puckette and company at IRCAM. The core of Pd is written and maintained by Miller Puckette and includes the work of many developers, making the whole package very much a community effort.
Fast Light Tool Kit
[13 users on Ohloh]
FLTK (pronounced "fulltick") is a cross-platform C++ GUI toolkit for UNIX/Linux (X11), Microsoft Windows, and Mac OS X. It provides modern GUI functionality without the bloat, and supports 3D graphics via OpenGL and its built-in GLUT emulation. FLTK is designed to be small and modular enough to be statically linked, and also works fine as a shared library. It also includes an excellent UI builder called FLUID that can be used to create applications in minutes.
RapidMiner (YALE): Java Data Mining
[10 users on Ohloh]
RapidMiner (formerly YALE) is the most comprehensive open-source software for intelligent data analysis, data mining, knowledge discovery, machine learning, predictive analytics, forecasting, and analytics in business intelligence (BI). RapidMiner provides more than 400 data mining operators, a graphical user interface (GUI), an online tutorial with hands-on data mining applications, a comprehensive PDF tutorial, many visualization schemes for data sets and data mining results, many different le...
[8 users on Ohloh]
PHPSpec is a Behaviour-Driven Development (BDD) framework written for PHP5.

It's objective is to supply a domain specific language for specifying the behaviour of code in terms of executable examples which although similar to unit tests, encourages a mind set better suited to applying BDD or TDD. This involves highly readable examples written using a plain English style DSL. Indeed, these examples can be parsed into plain text specifications which can be gived to anyone outside a developer...

[6 users on Ohloh]
args4j is a small Java class library that makes it easy to parse command line options/arguments in your CUI application.
[6 users on Ohloh]
Ultimate++ is a C++ cross-platform rapid application development suite. It includes a set of libraries (GUI, SQL, etc..), and an integrated development environment.

Rapid development is achieved by the smart and aggressive use of C++ rather than through fancy code generators. In this respect, U++ competes with popular scripting languages while preserving C/C++ runtime characteristics.