Vimm's Lair: Dumps of every PS3 game ever. Slow download speeds. https://vimm.net/vault/PS3

Nopaystation: best place to look for PSN content. Lots of DLCs and later release date games. PKGs come with rap files. No disk only games. https://nopaystation.com/

Pkgi: PKGi PS3 is a PlayStation 3 port of pkgi (PSVita). The pkgi-ps3 homebrew app allows to download and install .pkg files directly on your PS3. https://nopaystation.com/

/r/Roms Megathread: Lots of disk only games. Links to Internet Archive collections. Faster download speeds. https://r-roms.github.io/megathread/sony/#sony-playstation-3