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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.
[495 users on Ohloh]
GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK+ is suitable for projects ranging from small one-off projects to complete application suites.

GTK+ has been designed from the ground up to support a range of languages, not only C/C++. Using GTK+ from languages such as Perl and Python (especially in combination with the Glade GUI builder) provides an effective method of rapid application development.

GNU C Library
[426 users on Ohloh]
The GNU C Library, glibc, provides the standard C library interface for GNU/Linux and other Free Software operating systems.
[278 users on Ohloh]
GLib is the low-level core library that forms the basis of GTK+ and GNOME. It provides data structure handling for C, portability wrappers, and interfaces for such runtime functionality as an event loop, threads, dynamic loading, and an object system.
[223 users on Ohloh]
Qt is a cross-platform application and UI framework. Using Qt, you can write applications once and deploy them across many desktop and embedded operating systems without rewriting the source code.
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.

Quartz Enterprise Job Scheduler
[166 users on Ohloh]
Quartz is an enterprise-class job scheduler for integration with stand-alone Java applications and full-scale J2EE applications. Advanced features include clustering and participation in container managed transactions. It is highly scalable, very lightweight, and supports very complex scheduling.
KDElibs (KDE)
[145 users on Ohloh]
The KDE libraries, basis of KDE and used by many open source projects. They are based on Qt, Trolltech's cross-platform toolkit, and run on Linux, BSDs, and other Unices, as well as Microsoft Windows and Mac OS X.

Licensed under GNU LGPL, they may be used by open source and proprietary applications.

Simple DirectMedia Layer
[136 users on Ohloh]
A cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer.

SDL supports Linux, Windows, Windows CE, BeOS, MacOS, Mac OS X, FreeBSD, NetBSD, OpenBSD, BSD/OS, Solaris, IRIX, and QNX. The code contains unofficial support for AmigaOS, Dreamcast, Atari, AIX, OSF/Tru64, RISC OS, SymbianOS, and OS/2.

SDL is written in C, but works with C++ natively, and has bindings to several other language...

[125 users on Ohloh]
The GlassFish community is building free, open source, production-quality, enterprise software. The main deliverables is a production-quality Application Server that is also the Java EE 5 Reference Implementation.

There are 3 ongoing releases of the GlassFish AppServer. GlassFish v1 is in production. GlassFish v2 adds clustering, failover, features and performance and is close to beta3. GlassFish v3 adds a modular architecture with a very small kernel and is in early technology preview...

[109 users on Ohloh]
wxWidgets lets developers create applications for Win32, Mac OS X, GTK+, X11, Motif, WinCE, and more using one codebase. It can be used from languages such as C++, Python, Perl, and C#/.NET. Unlike other cross-platform toolkits, wxWidgets applications look and feel native. This is because wxWidgets uses the platform's own native controls rather than emulating them.
[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.

[92 users on Ohloh]
Mesa is an open-source implementation of the OpenGL specification - a system for rendering interactive 3D graphics.

A variety of device drivers allows Mesa to be used in many different environments ranging from software emulation to complete hardware acceleration for modern GPUs.

Mesa ties into several other open-source projects: the Direct Rendering Infrastructure and X.org to provide OpenGL support to users of X on Linux, FreeBSD and other operating systems.

[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.
[80 users on Ohloh]
Libxslt is the XSLT C library developed for the GNOME project. It is based on libxml2 the XML C library developed for the GNOME project. It also implements most of the EXSLT set of processor-portable extensions functions and some of Saxon's evaluate and expressions extensions.
[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.
[61 users on Ohloh]
wxPython is a Python extension module that wraps the wxWidgets cross-platform GUI library and provides an alternative to Tkinter and PythonWin. It attempts to mirror the class hierarchy of wxWidgets as closely as possible and is very versatile. It can be used to create standalone GUI applications or can be used in situations in which Python is embedded in a wxWidgets C++ application as an internal scripting or macro language. The currently supported GUIs are Win32, GTK/X-Windows, and Mac OS X.
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.