JUCE is an open-source cross-platform C++ application framework
Browser automation framework and ecosystem
Simple and Fast Multimedia Library
stb single-file public domain libraries for C/C++
Flexible level editor
Redpanda is a streaming data platform for developers
Matplot++: A C++ Graphics Library for Data Visualization
The open big data serving engine
Jsonnet, the data templating language
Cross-platform, cross-blockchain wallet library
NativeScript for Android using v8
A static analyzer for Java, C, C++, and Objective-C
Arduino FOC for BLDC and Stepper motors
The open-asset-importer-library repository
A cross platform C99 library to get cpu features at runtime
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
Object oriented frameworks - PowerBuilder, PowerServer & InfoMaker!
Software development for 4Mb portable, using Z80 CPU and AA batteries
Translate chains for 'Code::Blocks' projects
Releases of McuOnEclipse projects
It's a clone of 'https://sourceforge.net/projects/codedesigner/'
Cross-platform IDE for developing embedded solutions and desktops
Proximus is an Electronic System Level (ESL) design environment.