openssl / openssl

General-purpose toolkit implementing TLS, DTLS, and QUIC protocols on top of a standalone cryptographic library and CLI.

hathach / tinyusb

Cross-platform USB host and device stack in C for embedded systems, with no dynamic allocation and interrupts deferred to task context.

DaveGamble / cJSON

Ultralightweight JSON parser and printer written in ANSI C, distributed as a single source file and header.