Warframe, can get a bit grindy at times, but the team behind it are just fantastic overall. They listen to the community incredibly well, they aren't money hungry so the game is balanced in that way and it's just really fun imo. also, I've spent not enough time in this game imo
clicker heroes.
need I say anything else?
Realm of the Mad God I just remembered about and holy.. I just had a nostalgia trip. I used to play this game before I knew what steam was back when it was a browser game.
also was like, the only game I ever used hacks in because it was super simple and no one got banned but that later changed lol I actually loved this game when I was younger, and apparently it's still pretty active.
Secret World Legends I have a bit of a soft spot for even though I know it's an MMORPG, I know it doesn't have that good reviews on steam, but it's set in one of my most favourite game/anything universes EVER and one of my favourite ever game + other things companies have had a huge hand in it for certain things. It is a pretty enjoyable MMORPG imo, and it's the least grindy MMORPG I've ever played.