Rust doesn't exactly have things tagged as heap-free, but no_std category[1] contains many crates who have at least indicated that they don't use the standard l

Rust doesn't exactly have things tagged as heap-free, but no_std category[1] contains many crates who have at least indicated that they don't use the standard library. Some may pull in liballoc and still want to do allocation, but it's better than nothing. Additionally, many packages that normally require the standard library let you opt out of that, with reduced functionality. My team works in no-heap Rust. We use external packages. It's much easier than in any other ecosystem to do so. Even that bit above goes a very long way and saves a lot of work. 1: https://crates.io/categories/no-std https://crates.io/categories/no-std