UnReal World is a free, survival-focused roguelike rpg that came out in 1992 and is still actively being developed and improved. It’s got a lot of depth and a very cool fantasy setting heavily inspired by Finnish folklore (the developer is Finnish).
I highly recommend it if you’ve got the patience for an in-depth roguelike rpg.
For the longest time I thought Minecraft was free because I only ever pirated it. Lol
PlanetSide 2 is the free-to-play I keep going back to
Irisu Syndrome! is a favorite of mine. It’s only from 2008, so I personally don’t consider it retro. It’s tricky to learn at first since it doesn’t tell you anything about how to play and I don’t recall there being a manual. It’s also one of those games that you can’t really say too much about without spoiling things.
Super Crate Box. An incredibly addictive, simple 2D shooting game! It’s free on Steam!
Squarez Deluxe
Makes Tetris seem like a children’s toy
If we’re sticking strictly to free, I’m not sure Doom mods work if you only have the free version installed. Either way, people basically never stopped making wads since the game came out, and I try various ones out from time to time.
There are tons of them, so if you’re interested you can see what won the annual Cacowards throughout the years and start there.
Haven’t played recently, but this one came to mind’
I missed the original, but Scorched 3D was a big hit at my high school.
Frog Fractions
I don’t play it regularly, but it’s fun to tell people about it.
“Einstein puzzle” by Flowix games, copyright 2004-2005
I play it from time to time, to see if I can still complete it in under 4 minutes and my brain isn’t slowing down too much with age.
Technically, Dwarf fortress is the oldest game I still play, but I only got fully into it thanks to the non-free Steam version.
Beneath A Steel Sky (though I kinda prefer the grungier aesthetic of the Amiga floppy version)
Available free on ScummVM!
Has an excellent plot and wry sense of humour. Fun game.
Beyond All Reason!
Tyrian is still fantastic 30 years later!
I’ve probably played this game for over a hundred hours. Great soundtrack too, by Alexander Brandon. I also loved the minigame hidden behind the DESTRUCT cheat code.
And it’s open source too!
Desert strike? Not sure if it was free tho. Also road rash
The SNES game published by EA based loosely on the Gulf War? I’m pretty sure that one was payware.
Neither were free, both were amazing
I don’t know if it technically counts as freeware, but Space Cadet Pinball. Back on XP it was my go-to for something quick to play on the offline computer, and I just brought it with me to every new machine. Also it’s now been decompiled and will run on pretty much anything!