JUCE is an open-source cross-platform C++ application framework
A cross-platform file change monitor with multiple backends
Open source framework simplifying the creation of C++ applications
A text-based widget toolkit
Fastest feature-rich C++11/14/17/20 single-header testing framework
C++ Frontend for the RenderMan Interface
C++ Library for the Common Image Generator Interface
PC WeChat chat robot with secondary development interface
The best library to work with .Net Assemblies in any programming lang.
The best library to work with .Net Assemblies in C/C++.
Now maintained at https://code.google.com/p/lpi/
A minimalistic test framework written in C++.
PHP bindings for the cross-platform GUI library wxWidgets.
universal multi-platform light-weigth extensible scripting framework
generic protocol for communicating with microcontrollers
client and server HTTP(S) library for Boost C++ developers
An unified platform for desktop and Internet apps
A C++ Implementation of the MIT OpenBlocks Java Code