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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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Phaser
Discontinued Phaser is a fun, free and fast 2D game framework for making HTML5 games for desktop and mobile web browsers, supporting Canvas and WebGL rendering. [Moved to: https://github.com/phaserjs/phaser] (by photonstorm)
There are also ruby bindings for raylib (not maintained anymore) and a new project called Taylor, dunno much about that one but it seems quite simple
You may define that Ruby is "CRuby" (MRI), the full-fledged implementation of the Ruby programming language specification (https://github.com/ruby/spec/).
I'm a Ruby guy, but for making simple games I'll just use a js game framework like Phaser. Though admittedly I haven't tried any Ruby game frameworks in probably about a decade.