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esp8266-iot-framework
Discontinued Framework for IoT projects implementing HTTPS requests, a React web interface, WiFi manager, live dashboard, configuration manager, file manager and OTA updates.
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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-Air-Quality-Monitor
ESPHome configuration for a DIY indoor air quality monitor for CO₂ concentration, PM2.5 and PM10 concentrations, and temperature, humidity and pressure
Jeff Geerling has a nice post about them and Andrej Friesen has made a esp home config for them too.
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.