Godot Engine – Multi-platform 2D and 3D game engine

Bitcoin Core integration/staging tree

The Swift Programming Language

An open-source C++ library developed and used at Facebook.

Scalable, Portable and Distributed Gradient Boosting (GBDT, GBRT or GBM) Library, for Python, R, Java, Scala, C++ and more. Runs on single machine, Hadoop, Spark, Dask, Flink and DataFlow

A JavaScript engine optimized for running React Native.

QPanda 2 is an open source quantum computing framework developed by OriginQC that can be used to build, run, and optimize quantum algorithms.

Compilation, analysis and optimization framework for the Scaffold quantum programming language.

Hierarchical Visibility for Virtual Reality, which implements a hybrid CPU/GPU ray-caster, suited for real time rendering of effects such as lens distortion.