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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Daimonin
RPG / MMORPG
Daimonin Community

Epic Cards Battle (TCG)
card game / collectible card game
momoStorm Entertainment

League of Legends
strategy / MOBA
Riot Games

MapleStory
platformer / run and gun
Wizet

Pokémon Trading Card Game Online
card game / collectible card game
The Pokémon Company

Shakes & Fidget
RPG
Playa Games

Tibia
RPG / MMORPG
CipSoft

MechWarrior Online
shooter / MMOFPS
Piranha Games

Soda Dungeon
RPG / turn-based tactics
AN Productions

TERA
RPG / MMORPG
Bluehole, Inc.

Campaign Clicker
action / idle clicker
Springloaded

Guns and Robots
shooter / MMOFPS
Masthead Studios Ltd

Gwent: The Witcher Card Game
card game / collectible card game
CD Projekt

Heroes of the Storm
action / MOBA
Blizzard

Idle Champions of the Forgotten Realms
action / idle clicker
Codename Entertainment Inc.

Might & Magic Heroes Online
RPG / MMORPG
Related Designs

Moe! Ninja Girls
adventure / dating sim
NTT Solmare

Realm Grinder
strategy / idle clicker
Divine Games

Secret World Legends
RPG / MMORPG
Funcom

Yu-Gi-Oh! Duel Links
card game / collectible card game
Konami Digital Entertainment

Hero Zero
RPG
Playata GmbH