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BosqueLanguage
Discontinued The Bosque programming language is an experiment in regularized design for a machine assisted rapid and reliable software development lifecycle.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
https://github.com/Microsoft/BosqueLanguage
I'm not super familiar but it looked cool when I read about it a few years ago
Also, differentiable programming is interesting and getting lots of attention (jax, zygote, enzyme, kornia etc). I don't know if there is a "killer app" outside just training neural networks yet, but it's worth watching and e.g. kornia is doing some cools stuff