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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.
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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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tuya-cloudcutter
A tool that disconnects Tuya IoT devices from the cloud, allowing them to run completely locally.
Lastly, there is a https://github.com/tuya-cloudcutter/tuya-cloudcutter application that can let you flash ota for devices that have been done already.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.