Play free-to-play, with microtransactions games
Free-to-play games (commonly known as F2P) can be freely downloaded, installed and played without paying. Some free-to-play games offer the player the chance to buy items or services for real money (MMORPGs are the perfect example) in an online in-game marketplace. The cost of such items is often very low, hence the "micro" in "microtransactions". These items or services range from increased experience gain items to cosmetic enhancements, additional content, more character slots, etc.
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Realm of the Mad God Exalt
RPG / MMORPG
Wild Shadow Studios

AdVenture Capitalist
simulation / idle clicker
Hyper Hippo Games

Gems of War
puzzle / tile-matching
Infinity Plus 2

Hentai Heroes
simulation / dating sim
Kinkoid Studio

Vega Conflict
strategy / MMORTS
KIXEYE

VRChat
simulation / dating sim
VRChat Inc.

Therian Saga
RPG
Fatecraft

Cabal Online
RPG / MMORPG
ESTsoft Corp

AChat
simulation / dating sim
AChat Animation Studios

NosTale
RPG / MMORPG
Entwell Co.

Big Bang Empire
RPG
Playata GmbH

Smite
action / MOBA
Hi-Rez Studios

Love Beat
action
CRAZYDIAMOND CO.

Booty Calls
adventure / tile-matching
3X Entertainment Limited

Furcadia: the Second Dreaming
simulation
Dragon's Eye Productions

Sakura Clicker
RPG / idle clicker
Winged Cloud