If anyone is interested, you can try EngineeringSketchPad (https://acdl.mit.edu/ESP/) which is very similar but much more mature. It also supports simple geometric primitives and boolean operations via a scripting language, but also more general rational curves and surfaces (i.e. BREPs). It has other nice features like differentiation, application-specific views (think structural vs CFD), and an attention to water-tightness/correctness.

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gmac 8 hours ago | parent [-]

The certificate just expired, so mobile Safari is not willing to let me see it. :(

	▲	MITSardine 2 hours ago \| parent [-]
		I should have shared this more recent page directly on the manual with examples to begin with: https://flexcompute.github.io/EngineeringSketchPad/EngSketch...