http://isip.sejm.gov.pl/prawo/index.html
This database contains legal acts, in Polish only and free of charge.

http://www.de-iure-pl.org/
The website of the German-Polish Lawyers‘ Assossiation, which contains legal acts and case law. The information is also in available in German, but requires payment.

http://www.prawo.lex.pl/
A Polish law portal, which contains the Official Journal and legal acts but in Polish only. The information is free of charge.

http://www.trybunal.gov.pl/
The official website of the Polish Constitutional Tribunal. A summary of the decision and the website itself are available in English, too. Yet the summaries are unofficial. They do not contain literal quotations. Only the full versions of the Tribunal’s judicial decisions in Polish are of an official character. The information is free of charge.

http://www.sn.pl/
The official web presence of The Supreme Court of the Republic of Poland. This website and major current judicial decisions are also available in English. The information is free of charge.