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SourceCodeSyntaxHighlight
Quick Look extension for highlight source code files on macOS 10.15 and later.
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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.
This is probably the closest alternative: https://github.com/sindresorhus/quick-look-plugins
After some googling, I found https://github.com/sbarex/SourceCodeSyntaxHighlight along with https://findergg.com (which you already found)
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.