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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.
My favorite is Cockatrice even though you sound like a mostly in person seeking fellow. It is a web application that is like a card game simulator, it plays magic and can auto update to show you card images, doesn't cost a dime and theoretically could play other games like Android Netrunner if you really wanted to, downside is it sometimes changes domains if the authorities try and shut it down, but the last one https://cockatrice.github.io/ has been around a while. also no rules enforcement, but upside is play any format including some weirdness like "bring your own standard" from any era or tiny leaders, the all less than 3 mv commander played 1v1