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nut
The Network UPS Tools repository. UPS management protocol Informational RFC 9271 published by IETF at https://www.rfc-editor.org/info/rfc9271 Please star NUT on GitHub, this helps with sponsorships!
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netboot.xyz
Your favorite operating systems in one place. A network-based bootable operating system installer based on iPXE.
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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 use mine as a netboot server (with netboot.xyz), configured in a way that it registers as a proxy to the normal DHCP server with auztodected networking adresses. So I can just plug it in, wait a moment for the startup, and then use netbooting. I created a gist with details some time back. As it doesn't store more than the "bootloader" on the pi, the old pi1 is plenty fast enought for it :)