This Finpip overview summarizes XTB as commonly marketed to retail traders (founded 2002; HQ: Warsaw, Poland). Typical platforms include xStation 5, MetaTrader 4.
Regulatory snapshot (not legal advice): KNF Poland; FCA; CySEC; DFSA; FSCA; IFSC Belize offshore arm
Official website: https://www.xtb.com/. Confirm licence numbers, product availability, and costs there before funding an account.