It's a lightweight library to write a monodimensional PDE solver.,

A generic implementation of STL containers and some STL algorithms. It is absolutly independent from external types it use only types declared in type_traits. So containers can be used with any poiner types which satisfies PointerConcept.

bQella,

C++ implementation of R*-tree, an MVR-tree and a TPR-tree with C API,

The sigrok project aims at creating a portable, cross-platform, Free/Libre/Open-Source signal analysis software suite that supports various device types, such as logic analyzers, MSOs, oscilloscopes, multimeters, LCR meters, sound level meters, thermometers, anemometers, light meters, dataloggers, function generators, power supplies, GPIB interfaces, and more....

common viewing framework,

OCIPL is a C++ library to wrap the Oracle OCI API. It provides a high performance interface to databases using the native Oracle application interface. It uses C++ templates to achieve maximum flexibility and an easy to use programming interface. The implemented classes are encapsulated in the C++ Namespace OCIPL....

A iptv player / recorder for russian internet tv programmed in C++ (Qt) using the vlc API.

Schifra is a very robust, highly optimized and extremely configurable Reed-Solomon error correcting code library for both software and IP core based applications with implementations in C++ and VHDL.
Schifra supports standard, shortened and punctured Reed-Solomon codes. It also has support for stacked product codes and interleaving....

Command line parameters parser with callback correspond functions and, if necessary, type/semantic checking of values of inputed parameters.
Uses ISO C++ and Boost C++ libraries only.
Header-only (not need to build) and cross-platform.
It's really simple to use!...