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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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esphome
ESPHome is a system to control your ESP8266/ESP32 by simple yet powerful configuration files and control them remotely through Home Automation systems.
It can, wasm3 is a wasm interpretor ported to a lot of bare metal microcontrollers: https://github.com/wasm3/wasm3
I've been having a lot of fun with https://kalumajs.org/ recently for silly JS embedded things. It's been great so far, and has a cool little community!
It's a runtime built on top of JerryScript, which has been pretty neat to look into as well: https://jerryscript.net/
Relevant: ESPHome is a firmware for esp8266 / esp32 series IoT chipsets that can be configured mostly with a web gui or yaml file.
https://esphome.io