Someone also uses notepad as a debug console [1]. There is even a Rust crate for that [2].

[1] https://www.reddit.com/r/programming/comments/gnazif/ray_tra... (I've first seen this from Steve Klabnik's tweet https://twitter.com/steveklabnik/status/1263190719721766918)

[2] https://crates.io/crates/notepad_logger