Andrew's Babelmap [1] is one of those applications that, if you do anything text or typography related, is basically required owning. With a donation, of course.
I work mostly on Linux so I hacked a Character Viewer clone in Rust over a weekend recently[1].
It just does what I need but I'm planning to add features to it if I find them useful.
So I am curious: what functions does BabelMap offer that you can't live without, especially as a typographer?