Не сказал бы что очень активно, но уже месяц-другой рыскаем в Steam и других магазинах в поисках интересных кооперативных игр. И что-то всё очень сложно.
Из хорошего для кооп игры (правда, некоторые тайтлы всё же максимум на двух, но вдруг кому интересно будет)
https://store.steampowered.com/app/473690/Absolver/
https://store.steampowered.com/app/280160/Aragami/
https://store.steampowered.com/app/238460/BattleBlock_Theater/
https://store.steampowered.com/app/420290/Blackwake/
https://store.steampowered.com/app/501590/Bulletstorm_Full_Clip_Edition/
https://store.steampowered.com/app/204360/Castle_Crashers/
https://store.steampowered.com/app/440900/Conan_Exiles/
https://store.steampowered.com/app/381210/Dead_by_Daylight/
https://store.steampowered.com/app/548430/Deep_Rock_Galactic/
https://store.steampowered.com/app/1085660/Destiny_2/
https://store.steampowered.com/app/435150/Divinity_Original_Sin_2__Definitive_Edition/
https://store.steampowered.com/app/248610/Door_Kickers/
https://store.steampowered.com/app/236110/Dungeon_Defenders_II/
https://store.steampowered.com/app/527230/For_The_King/
часть 2)
https://store.steampowered.com/app/226860/Galactic_Civilizations_III/
https://store.steampowered.com/app/360170/How_to_Survive_2/
https://store.steampowered.com/app/1250/Killing_Floor/
https://store.steampowered.com/app/232090/Killing_Floor_2/
https://store.steampowered.com/app/448510/Overcooked/
https://store.steampowered.com/app/728880/Overcooked_2/
https://store.steampowered.com/app/218620/PAYDAY_2/
https://store.steampowered.com/app/291860/Pit_People/
https://store.steampowered.com/app/41070/Serious_Sam_3_BFE/
https://store.steampowered.com/app/225840/Sven_Coop/
https://store.steampowered.com/app/35700/Trine_Enchanted_Edition/
https://store.steampowered.com/app/35720/Trine_2_Complete_Story/
https://store.steampowered.com/app/319910/Trine_3_The_Artifacts_of_Power/
https://store.steampowered.com/app/690640/Trine_4_The_Nightmare_Prince/
https://store.steampowered.com/app/607050/Wargroove/
Есть ещё масса других игр, но это из того, что навскидку вспомнил из библиотеки стима)