Tiny, fast(ish), self-contained, fully loaded printf, sprinf etc. implementation; particularly useful in embedded systems.

Low footprint C/C++ CBOR library and Python tool providing code generation from CDDL descriptions.

Ultralightweight JSON parser in ANSI C

A very specific use case: Blue Pill (stm32f103c8t6) with USB host shield (MAX3421e) to use RedGear Game controller

Arduino C code for MAX30102 pulse oximetry sensor (MAXIM Integrated, Inc.)