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pie
The Pie language, which accompanies The Little Typer by Friedman and Christiansen (by the-little-typer)
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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.
Pie, a dependently typed language for learning dependently typed programming
For a simple, but real language example, check: https://github.com/soegaard/minipascal
We (Racket community members) ran a competition last year: you can look at the entries to see the diversity of languages people create with Racket: https://github.com/lang-party/Summer2022/issues
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.