Besides Python and Java, it's also the sorting algorithm used by Chrome, Android, and Swift. At this point I think more than half the world's programmers are using Timsort, whether they realize it or not.
And Rust, the rust std lib uses a modified timsort/mergesort
FWIW, Rust uses Pattern-defeating quicksort for it's unstable sort.
[1] https://github.com/orlp/pdqsort [2] https://doc.rust-lang.org/std/vec/struct.Vec.html#method.sor...