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Pojav launcher
A Minecraft: Java Edition Launcher for Android and iOS based on Boardwalk. This repository contains source code for iOS/iPadOS platform.
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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.
I was going to say I thought Java works on iOS too but apparently you need root in most cases: https://github.com/PojavLauncherTeam/PojavLauncher_iOS/issues/334
It's true that there are a lot of sites that I don't use because of nonfree JavaScript, but some of the more popular sites have alternative front-ends that don't even require client-side software (e.g. Invidious).
You might find this project interesting: TrueCraft (The physics are really janky in my experience unfortunately.)
This is somewhat helpful: https://github.com/SimHacker/micropolis/tree/daa4297696d955a93b051627e6d84a7da5f8a4a3/micropolis-activity/src/notes