CardStock[0] isn’t mentioned in this article, but seems broadly similar in goals and approach to Scrappy. Unlike Scrappy (so far as I can tell) CardStock is open-source and can be run locally.[1]
Decker[2] (which is also open-source) has answers to several of the things outlined on Scrappy’s roadmap, including facilities for representing and manipulating tabular data with its query language and grid widgets and the ability for users to abstract collections of parts into reusable "Contraptions".
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