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wall-ink
ESP8266 based e-ink conference room scheduler display. Repurposable through PHP-based server plugins to display any image. Outlook, Exchange, Booked, Google Calendar API and iCal server scheduler support.
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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.
I'll use this thread as an opportunity to mention the open-source e-ink based solution out of BYU. (I have no affiliation.)
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.