You can also check rome2rio.com to plan a route between cities of Poland & all over the world.
If you need more details about municipal transport about the city, website jakdojade.pl may come in handy.
Both these sites have a mobile application.
Those two pages seem to be good (I’ve never used them myself, but they’re showing many connections and you can even buy some tickets on-line):
Between Kraków and Katowice, for example, CheckMyBus is showing ~40 daily connections.
If you need to look for public transport inside of cities / agglomerations, the best website is Jakdojade. It supports every major and middle city.
About the particular companies, I believe the your main choice is between FlixBus (formerly PolskiBus), LEO Express and many other smaller ones, which mostly operate between several cities only.
Credit:stackoverflow.com‘
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