K-Meter is a free implementation of a K-System meter according to Bob Katz' specifications.

Equalizer is an open source programming interface and resource management system for scalable OpenGL applications. An Equalizer application can run unmodified on any visualization system, from a singlepipe workstation to large scale graphics clusters and multi-GPU workstations. Equalizer is built upon a parallel OpenGL-based programming interface solving problems that are common to any multipipe application. The API is minimally invasive, making application porting as easy as possible while delivering maximum performance....

Custom C++ Minecraft server
Fast, highly customizable and resource-tight. Runs on Windows, Linux, MacOS and Android. Can be run on a PC, RaspberryPi or a smartphone.

DOSEMU stands for DOS Emulation, and allows you to run DOS and many DOS programs, including many DPMI applications such as DOOM and Windows 3.1, under Linux.

That project aims at providing a clean API, and the corresponding C++ implementation, for the basis of Airline IT Business Object Model (BOM), ie, to be used by several other Open Source projects, such as RMOL, Air-Sched, Travel-CCM, OpenTREP, etc.

HHVM is a new open-source virtual machine designed for executing programs written in PHP. HHVM uses a just-in-time (JIT) compilation approach to achieve superior performance while maintaining the flexibility that PHP developers are accustomed to.

Esperanza is an XMMS2 client written with C++ / Qt4 and aims to be cross-platform goodness for everyone.

The BarbequeRTRM framework is the core of an highly modular and extensible run-time resource manager which provide support for an easy integration and management of multiple applications competing on the usage of one (or more) shared MIMD many-core computation devices. The framework design, which exposes different plugin interfaces, provides support for pluggable policies for both resource scheduling and the management of applications coordination and reconfiguration....

“Orocos” is the acronym of the Open Robot Control Software project. The project's aim is to develop a general-purpose, free software, and modular framework for robot and machine control. The Orocos project supports 4 C++ libraries: the Real-Time Toolkit, the Kinematics and Dynamics Library, the Bayesian Filtering Library and the Orocos Component Library....

SFLphone is a robust, standards-compliant enterprise softphone, for desktop and embedded systems. It is designed to handle several hundred calls a day. SFLphone is available under the GNU GPL license, version 3.