Ultra-compact ESP32-C3 development board (9.85x8.45 mm) with barebones RF design, ~$10.75 for 5 boards, and step-by-step build/flash instructions.
Open-source ESP32-wideband G.722 addon for PCMFlow delivering 64 kbps HD-voice with ~12 KB flash and ~0.5 KB RAM per direction; MIT/public-domain licensing; latest release v0.2.0 (May 25, 2026).
Muxcard is a credit-card-sized, ESP32-C3–based computer with an e-paper display and NFC, demonstrated as an ultra-thin prototype with ongoing DIY hardware work.
TinyOS is an ultra-lightweight Cortex-M RTOS with a small footprint and concrete performance characteristics, offering broad embedded features (TLS/DTLS, MQTT, CoAP, OTA, shell, FS) and explicit RAM/ROM requirements.
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