Carbon Language's main repository: documents, design, implementation, and related tools. (NOTE: Carbon Language is experimental; see README)

Emscripten: An LLVM-to-WebAssembly Compiler

C++ wrappers for SIMD intrinsics and parallelized, optimized mathematical functions (SSE, AVX, AVX512, NEON, SVE, WebAssembly, VSX, RISC-V))

Python compiler

Official main repository for LFortran

Implementation of the Jupyter kernel protocol in C++

Jupyter kernel for the Python programming language

C++20 idiomatic APIs for the Apache Arrow Columnar Format

A Clang-based C++ Interoperability Library

Jupyter kernel for the R programming language

C++ compiler

Swift Playgrounds on Windows!

Emscripten-based middleware for xeus

ZeroMQ-based middleware for xeus

Debugging xeus-cpp-lite