I’ve been working on a specific idea for some time - microdiagrams DSL. The core concept is quite straightforward: instead of having one language for all diagrams, have multiple languages for various purposes. For example, this diagram is designed to help learn piano by illustrating the relationship between different keys. This idea had multiple prototypes. I won’t get into the details why (hey, I hope to make some money out of it someday!), but I’ve entertained the same idea for quite some time. One would say that technology doesn’t matter, but I disagree. I think that for side projects (or Magnum Opus for that), one shouldn’t use boring technology.