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ups
Linux Status and Configuration application for Mini-Box.com Open UPS, Open UPS 2 and NUC UPS (by mini-box)
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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.
There are some other options in that thread at varying levels of DIY, but some highlights include the mini power supplies and DC-DC converters from mini-box: https://www.mini-box.com/micro-UPS-load-sharing and Pololu has some high powered DC converters that you could use: https://www.pololu.com/category/133/step-up-step-down-voltage-regulators.
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.