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Opencore-Legacy-Patcher
Discontinued [Moved to: https://github.com/dortania/OpenCore-Legacy-Patcher]
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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.
If your old MBP doesn't have the softwareupdate command available (I don't remember when Apple added it), you can try something like Graham Pugh's installinstallmacos.py script, from Github: https://github.com/grahampugh/macadmin-scripts
You can just download the OS to use it else where or install it using opecore-legacy_patcher.
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.