Non-serif fonts: Kurier and Iwona. Kurier was designed in pre-computing times by Małgorzata Budyta, digitized and extended by Janusz M. Nowacki. He went on to design Iwona, which is very firmly based on Kurier. Iwona is named after Janusz's daughter.
Multiple weights available in normal and condensed: Light, Regular, Medium, Bold, Heavy, Light Italic, Regular Italic, Medium Italic, Bold Italic, Heavy Italic
Support for small caps, old style numerals, Greek, Cyrillic, full math support in TeX, ...
By: Bogusław Jackowski, Janusz M. Nowacki, GUST (http://www.gust.org.pl/projects/e-foundry)