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ProtocolSupport
Support 1.18, 1.17, 1.16, 1.15, 1.14, 1.13, 1.12, 1.11, 1.10, 1.9, 1.8, 1.7, 1.6, 1.5, 1.4.7 clients on Spigot/Paper 1.18.1
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Waterdog
Discontinued Fork of Waterdog proxy with support from WDPE team. Currently protocol updates only.
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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.
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java2bedrock.sh
Converts 2D and 3D item predicates from Minecraft Java Edition to Minecraft Bedrock Edition
My memory is a bit hazy, but as far I know they use (or had used?) a private fork of ProtocolSupport that had Minecraft Bedrock support. They hired the lead developer to maintain it. This was before Geyser existed.
I use https://github.com/Kas-tle/java2bedrock.sh to convert my Java resource pack to Bedrock, it works pretty well!