Call of Combat

Set in WWII, each player controls 4 infantry soldiers in battles involving up to 120 soldiers on each side. Using rifles, machine guns, grenades and your wits you must defeat the enemy and survive.

Free to play indefinitely.

Castle Empire

See The Settlers Online. Castle Empire is a browser-based MMO strategy game developed by Ubisoft. You start with a town center, construct buildings, gather resources, explore the map and attack lawless robbers once you’ve reached level 17. There are nine troop varieties and numerous resource types that players can use to their advantage. Castle Empire has plenty of social features – for example, you can add friends and send them goods – and this is handy because the game can get tiring after the initial power-leveling is finished. Later in the game players can equip their explorers with minerals which allow them to search for adventures (these always end in a big battle with great rewards).

The graphics are nice, and the game runs smoothly on older computers too. PvP is yet to be implemented. Altogether, if you already like this kind of strategy game, Castle Empire is a completely harmless time waster – but definitely not anything groundbreakingly original.

Free, with option to pay for additional features.

Club Marian

Customize your character, go for a drive and explore the island. You can chat with people from around the world, do a little smash up derby and dance with your friends in this new 3D persistent world.

Free to play indefinitely.

Company of Heroes

Complex and detailed RTS set during WWII. Depending on which faction you choose and which expansion you play, you can command a host of different units including specialized infantry, armored assault vehicles and air support. The game supports campaigns, closed games with buddies (even via LAN), and auto-matching and ranking systems to play against new opponents. The original game was succeeded by two standalone expansions that play well with each other:

• Company of Heroes: Opposing Fronts
• Company of Heroes: Tales of Valor

Free, with option to pay for additional features.

Conquer Online

A free anime-themed martial arts online rpg with gorgeous graphics. Features a rich skill system and many different weapon styles. A truly international game, with servers all over the world. The client download is roughly 600 mb.

Free, with option to pay for additional features.

Counter-Strike 2D

A fun little 2D top-down version of the game Counter-Strike.

Free to play indefinitely.

Crimson Angel

Crimson Angel is an action-packed ARPG that draws fans of games like "Diablo" and "Path of Exile." It features stunning 3D graphics and a dynamic combat system, immersing players in a magical adventure filled with epic quests, legendary armors, and powerful weapons. The game stands out with its rich character customization and challenging PvP and PvE content, including dungeon raids and legendary boss battles. Dive into this epic journey and unleash divine powers to conquer evil forces.

Free, with option to pay for additional features.

Cross Fire

A military-themed first person shooter. Engage in ferocious battles with other players throughout multiple levels. Features persistent rankings and four game modes -- including the stealth-action "Ghost Mode". PC/Windows only.

Free to play indefinitely.

Crossout

Crossout is an adrenaline-fueled, post-apocalyptic MMO action game that lets you build and customize unique combat vehicles from an extensive range of parts, similar to "Mad Max" and "Twisted Metal." Engage in explosive PvP battles, using anything from machine guns to rocket launchers, and experience advanced damage mechanics that affect performance in real-time. What sets it apart is the freedom of creativity in vehicle design and the rich trading system, where every piece can be auctioned. Dive into PvE missions with AI-driven enemies and player-created bosses for endless excitement.

Free, with option to pay for additional features.

Crowns of Power

Player governed RPG. The reduced population per server (in the hundreds) compared to other multi-player games allows for a closer community in the 3d fantasy world of Arder. Get elected by fellow players for positions of esteem in the game world while leveling up your character and choosing from five different schools of magic with hundreds of spells. True player versus player world with heavy consequences for unwanted attacks.

Free, with option to pay for additional features.

CRSED: F.O.A.D

CRSED: F.O.A.D. is an intense battle royale game that combines traditional last-man-standing gameplay with unique mystical elements, similar to "PUBG" and "Apex Legends." Players can use a wide range of weapons, from melee to modern firearms, and harness supernatural abilities to gain an edge in combat. What sets CRSED apart are its rituals and magic spells, allowing players to summon zombies or become invisible. The game also boasts deep character customization and a variety of tactical options, making each match a thrilling and unpredictable experience.

Free, with option to pay for additional features.

Crystal Saga

Crystal Saga is a free browser-based MMORPG. It's fairly standard for its genre, relying on the usual five classes (Knight, Rogue, Mage, Priest and Ranger), and not offering many innovations. However, Crystal Saga's strengths begin with its gorgeous 2D fantasy art and silky animation, featuring over-the-top costumes and special effects. And Crystal Saga's “auto-pilot” feature lets players grind through monsters while being AFK, which really takes away a lot of the drudgery common to browser RPGs.

Crystal Saga includes a good PvP system with PK environments on designated servers. Open PvP is only available to level 20+ players. Five PVP states are available: Peace mode won’t allow you to attack anyone; Evil is lets you attack everyone; Justice allows you to attack red-named players. Finally, Party and Guild modes protect your allies from friendly fires.

The quests are the usual go-and-fetch and kill-X-number-of-monsters. The gameplay of Crystal Saga is mostly typical for an MMORPG game but it features a robust pet system. Like players, the pets also engage in combat, level up, evolve, and learn skills, and players can distribute stats for their pet’s growth.

Free, with option to pay for additional features.

Cube

A multiplayer 3D FPS game based on a totally new and unconventional engine with built-in level editor, IM, range of maps and a range of weapons. Availible for Linux, Windows, MacOS X, BSD.

Free to play indefinitely.