Can anyone identify this spider? (greater Poland region)
That looks like a Funnelweb Weaver (family Agelenidae), specifically Tegenaria atrica,  based on the patterning of the abdomen and thorax.


Female Tegenaria atrica, picture by Jørgen Lissner

Their range includes Poland:

Range: Andorra, Austria, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Faroe Islands (introduced), Finland, France (Corsica), France (Mainland), Germany, Great Britain (Channel Islands), Great Britain (Mainland), Great Britain (Northern Ireland), Greece (Crete), Greece (Dodecanese Islands), Greece (Mainland), Ireland, Italy (Mainland), Latvia, Liechtenstein, Lithuania, Macedonia, Netherlands, Norway (Mainland), Poland, Portugal (Mainland), Romania, Slovakia, Spain (Mainland), Sweden, Switzerland, Ukraine, Yugoslavia (van Helsdingen 2009.1).

Source: http://www.jorgenlissner.dk/families.aspx