IO91pm
Command-line calculator for Maidenhead- (QTH-, QRA-) Locators.
...
* The repository for my GNU/Linux distro has only one such a QTH-calculator.
--- This program has a few issues
--- Made worse by the adaption for Ubuntu, that removed half of its functionality
So, I had to roll my own. (Which I enjoyed anyhow.)
Perhaps also useful for others