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tModLoader
A mod to make and play Terraria mods. Supports Terraria 1.4 installations - TML itself is 1.3 Terraria currently (by Chik3r)
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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.
tML is open source, meaning anyone can contribute. It's also actively being developed, have you tried looking at the tmodloader github? (link: tModLoader/tModLoader at 1.4 (github.com) )
And the tML team is working on having betas soonTM, it's mainly being delayed by trying to get .NET core working iirc. If you really are so impatient, there are unofficial nightly builds: Home ยท Chik3r/tModLoader Wiki (github.com)