While googling around the 1001fonts.com turned out to be a miracle answer to my question.
Mostly because:
- it has an amazing collection of typewriter-like fonts (137 when writing this),
- among them most fonts are free for private use and a number is free for commercial usage,
- it has an on-line example tool, which allows you to type any text into a box and see it rendered in given font, so you can validate support for your language / characters without even downloading the files.
With just a ten minutes of quick work I managed to locate seven fonts that:
- are purely typewriter-like,
- supports Polish language's national characters,
- are free for commercial or private usage (donation encouraged!).
This list included:
- Free For Commercial Use:
- Free For Personal Use only:
- JMH Typewriter,
- Bohemian, and
- Punktype.
Far, far more than I expecetd.