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Starlight
Discontinued Rewrites the light engine to fix lighting performance and lighting errors (by PaperMC)
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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.
The Mods I would especially recommend for 1.16+ are FerriteCore, Magnesium OR Rubidium (these are incompatible with optifine, for shaders you can use rubidium with Oculus. I would recommend using Magnesium when possible) and Magnesium Extras, as well as Starlight (Starlight X Create if you are on 1.16.5 and are using create) and LazyDFU
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.