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Swift is at least in the TIOBE Top 20 (#20) and Scratch is at #12 but more educational. I'd also add Kotlin and Dart as contenders which sit just outside the top 20.

Rust is still considered by many to be pretty niche... as much as I like Rust and as widely as it is starting to be used. I especially like it with agent/ai use as the agent output tends to be much higher quality than other languages I've tried with them.

Zig. So make that 3.

It is also used in Ghostty, Bun which is the JS runtime that powers OpenCode, and Claude Code.

Still Go/Rust/Typescript is on a whole other level of adoption compared to Zig