There are 20 repositories under single-header topic.
A single-header ANSI C immediate mode cross-platform GUI library
A curated list of awesome header-only C++ libraries
Activity Indicators for Modern C++
A simple math library for games and computer graphics. Compatible with both C and C++. Public domain and easy to modify.
match(it): A lightweight single-header pattern-matching library for C++17 with macro-free APIs.
Love template metaprogramming
Single-header CLI with history and autocompletion for embedded systems (like Arduino or STM32)
Invoke functions with a spoofed return address. For 32-bit Windows binaries. Supports __fastcall, __thiscall, __stdcall and __cdecl calling conventions. Written in C++17.
C++20 Dynamic Reflection Library
Single header template based general purpose memory allocation library for Linux & Windows. Repo also provides a live http memory profiler as a separate single-header with no dependencies