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expensereport
The ExpenseReport legacy code refactoring kata in >50 programming languages (Ada to Zig)
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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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brigadier
Brigadier is a command parser & dispatcher, designed and developed for Minecraft: Java Edition.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
HolyC is recognized by Github, so it's something else. See here: https://github.com/cia-foundation/TempleOS
It doesn't mean Github doesn't know what the languages are, just that they're not used as much as some others in the project. A prime example is https://github.com/christianhujer/expensereport which lists Assembly, Makefile, Kotlin, BASIC, TypeScript and Shell with "Other 62.8%" - in that case, "Other" includes everything from Python to Prolog.
Here is a longer list of esoteric languages
Advent of Code, every day in a different language.