Header Only GitHub Repositories (2026) · Open Source Tools

JSON for Modern C++

Static reflection for enums (to string, from string, iteration) for modern C++, work with any enum type without any macro or boilerplate code

Extremely fast, in memory, serialization, reflection, and RPC library for C++. JSON, BEVE, BSON, CBOR, CSV, JSONB, MessagePack, TOML, YAML, EETF

A C++ header-only HTTP/HTTPS server and client library

Argument Parser for Modern C++

Fast, modern C++ DSP framework, FFT, Sample Rate Conversion, FIR/IIR/Biquad Filters (SSE, AVX, AVX-512, ARM NEON, RISC-V RVV)

C++14 concurrent lock-free low-latency queue.

A general-purpose lightweight C++ graph library

Parsing Expression Grammar Template Library

Header-only C++ binding for libzmq

A modern, mostly zero-allocation C++23 library for working with low-level Windows within user-space. Iteration over loaded modules via PEB, EAT iteration, lazy imports, syscalls, and more.

Nameof operator for modern C++, simply obtain the name of a variable, type, function, macro, and enum

A single file C++ header-only PEG (Parsing Expression Grammars) library

Random for modern C++ with convenient API

A C++11 library for parsing and serializing JSON to and from a DOM container in memory.

A modern, fast, lightweight thread pool library based on C++2x

optional lite - A C++17-like optional, a nullable object for C++98, C++11 and later in a single-file header-only library

A C++17 message passing library based on MPI

any lite - A C++17-like any, a type-safe container for single values of any type for C++98, C++11 and later in a single-file header-only library

C++20 coroutine library