Serious answer: You can actually download and use the Nim compiler. It is mature and will hit 2.0 soon.
Nim is open-source. Mojo appears to use manual memory management with borrow checking, like Rust, whereas Nim has fully automatic, yet deterministic, memory management via ARC (<https://nim-lang.org/blog/2020/10/15/introduction-to-arc-orc-in-nim.html>)
