MAME is a multi-purpose emulation framework
Cross-platform, customizable ML solutions for live and streaming media
An efficient, small mobile key-value storage framework
A Fast and Easy to use microframework for the web
JUCE is an open-source cross-platform C++ application framework
Lightning fast C++/CUDA neural network framework
A fast and reliable entity component system (ECS) and much more
A cross-platform file change monitor with multiple backends
A flight software and embedded systems framework
Restbed framework brings asynchronous RESTful functionality
Redpanda is a streaming data platform for developers
Communication framework for data-centric high-performance applications
Open source framework simplifying the creation of C++ applications
Portable and lightweight cross-platform desktop application
TreeFrog Framework, High-speed C++ MVC Framework for Web Applications
Real-Time Event Frameworks based on active objects & state machines
C++ framework with an ide.
ALFOUR Programming language. Simple, safe, power, multi-platform.
Object oriented frameworks - PowerBuilder, PowerServer & InfoMaker!
Remove Inequality by Production of Knowledge.
Portable and lightweight cross platform app development framework
A cross-platform GUI library
Source code is here - https://sourceforge.net/projects/lcmd-git/