header-only

nlohmann/json

+29

JSON for Modern C++

cpp-httplib

+30

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

skypjack/entt

+17

Gaming meets modern C++ - a fast and reliable entity component system (ECS) and much more

gabime/spdlog

+20

Fast C++ logging library.

glaze

+15

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

Nuklear

+16

A single-header ANSI C immediate mode cross-platform GUI library

CrowCpp/Crow

+9

A Fast and Easy to use microframework for the web.

magic_enum

+6

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

SPSCQueue

+6

A bounded single-producer single-consumer wait-free and lock-free queue written in C++11