There are 2 repositories under header-only-library topic.
A fast & densely stored hashmap and hashset based on robin-hood backward shift deletion
A C++14-compatible physical units library with no dependencies and a single-file delivery option. Emphasis on safety, accessibility, performance, and developer experience.
C++ MongoDB API and BSON/JSON Serialization library
Recursive Variant: A simple library for Recursive Variant Types
Super small, simple, and (almost) completely C89-compliant single-header arena "allocator".
Small Extremely Powerful Header Only C++ Lexical Analyzer/String Parser Library
A C++ Header-Only Hierarchical State Tree Library
Semantic Versioning library for modern C++.
Simple and Fast single header Bitmap (BMP) C++ library
Professionally written C++ function traits library (single header-only) for retrieving info about any function (arg types, arg count, return type, etc.)
constixel is a single header minimalistic constexpr C++20 2D graphics rendering library
A C++ header-only library for efficient move generation in chess using "magic bitboards" technique
A header only C++ library for easier logging to the console that includes features like coloring text, printing data structures, cursor manipulation, and more
Header-only library for dynamic DLL proxying in one function call
A highly customizable header only RTTI analysis and VFT hooking toolset.
Argy: Command-line parsing library for modern C++ — simple, intuitive, and header-only with no dependencies.
One header file library that implement missing transcendental math functions (cos, sin, acos, and more....) using 100% AVX/Neon instructions (no branching)
Single-header C++ library for fast/low-memory VCF (Variant Call Format) parsing.
C++ genetic algorithms scientific library
CUDA/HIP header-only library for low-precision (16 bit, 8 bit) and vectorized GPU kernel development
A C++ structure to manage multi-dimensional data efficiently and safely
A collection of generic header only data structures written in C
Highly optimized, constexpr-ready collection streams for C++17/20.
Base 16/32/64 and Bittorrent Encoding/Decoding Header Only Library
A C++ Framework for Evolutionary Single-Objective Optimization Benchmarking