Warthunder is free, though once you get pretty into it playing free is insanely grindy.
It’s a… war vehicle simulator, I guess? I mostly play planes, but tanks and boats also exist.
Someone else mentioned DCS. Planes in Warthunder are significantly less simulator, but they’re still not particularly arcade-y unless you’re playing the Arcade mode.
Warframe is also free. It’s kinda hit or miss, but if it hits it really hits.
Emulators are also cool- PCSX2 is a solid PS2 emulator, and RPCS3 is a fantastic PS3 emulator.