Jackbox games of course. There’s also Genital Jousting.

Pico Park is fun. https://www.co-optimus.com/game/7748/pc/pico-park.html

Tabletop Simulator is always my go to for big group local co-op (I believe it supports up to 10 players.) Pico Park 2 might be more akin to what you're looking for.

You can also check co-op.gg and filter by storefront, #of players, local, online, etc to see what results they give you! Just double check the game's individual chart to make sure the local co-op limit.

Duck Game has 8 player support on PC and is a great party game.

Pretty sure Clusterpuck '99 on Steam supports up to 8

I'm pretty sure there's a specific Bomberman console release you can emulate with 8 players.

You could also emulate Smash Bros Ultimate, as it has 8 player support. Might be boring to just play a Switch game many people have though. Maybe look into mods for it?

And you can always use co-optimus to search for stuff. Just set At least 8 players, couch co-op in the filters: https://www.co-optimus.com/system/4/pc.html

https://skribbl.io/ if you are willing to give up the controller for a phone screen

added to Gaming suggestion requests with answers from other communities in !videogamesuggestions@lemmy.zip

https://store.steampowered.com/app/469820/Genital_Jousting/ This one

• Towerfall 8-player
• Raining Blobs
• Some versions of Bomberman go up to 8 players

https://store.steampowered.com/app/467810/Splody/

It is a Bomberman rip-off, but very fun. The Steam page claims they can support any number of players, but recommends limiting it to 4-20.

Peak with the host running the more players mod can do at least 8 players in a session. It's pretty great fun

Golf with Friends, maybe?

also Screencheat

As a fallback, you could also have some hotseat games. Was recently thinking of HedgeWars again, which is basically open-source Worms Armageddon.

https://hedgewars.org/about.html

I think Brawlhalla supports 8 players

bro force

Sackboy a big adventure

I believe TMNT shredder's revenge goes up to 6, beat'em up style game: https://store.steampowered.com/app/1361510/Teenage_Mutant_Ninja_Turtles_Shredders_Revenge/

For 8 specifically I can only think of pico park 1 and 2

More people need to know about MegaMan 8-bit DeathMatch

https://mm8bdm.net/home

Can you even connect that many controllers to one computer without a bunch of dongles?

Unrailed 2, I'm pretty sure I read somewhere that it supports 8 player local coop, but might be worth double checking before buying

BRAWLHALLA!

TowerFall, Samurai Gun, Mount Your friends, Genital Jousting, starwhal, duck game, crawl, gang beasts, lethal league, magica, Monaco, nidhogg, wobbly life, tmnt splintered fate

I think most of those only go to 4, some to 2.