C-Dogs

Inspired game: C-Dogs SDL

Cadaver

Inspired game: Cadaver

Caesar 3

Inspired games: Augustus, CaesarIA, Julius

Call to Power II

Inspired game: Civilization: Call To Power 2 Source Project

Cannon Fodder

Inspired game: Open Fodder

Carrier Command

Inspired game: Thunder&Lightning

Castle of the Winds

Inspired games: Castle of the Winds, Castle of the Winds in Elm

Castle Wolfenstein

Inspired games: DUGA, Gloomy Dungeons, Gloomy Dungeons 2

Cataclysm

Inspired game: Cataclysm: Dark Days Ahead

Catacomb

Inspired game: CatacombSDL

Catacomb 3-D

Inspired games: CatacombGL, Reflection Keen

Catacomb Adventure Series

Inspired game: Reflection Keen

Catacomb II

Inspired game: CatacombSDL

Catan

Inspired game: Catan Dice Game

Cave Story

Inspired games: doukutsu-rs, NXEngine, NXEngine-evo

Chip's Challenge

Inspired game: Tile World

Chris Sawyer's Locomotion

Inspired game: OpenLoco

Chromium B.S.U.

Inspired game: Celestron

ChuChu Rocket!

Inspired game: Duck Marines

Circus Atari

Inspired game: Circus Linux!

Civilization

Inspired games: CivOne, FreeCol

Civilization II

Inspired games: C-evo, Freeciv, Freeciv-web

Civilization series

Inspired game: Conquests

Civilization V

Inspired game: UnCiv

Claw

Inspired game: OpenClaw

Clonk

Inspired game: OpenClonk

Colobot

Inspired game: Colobot: Gold Edition

Colonization

Inspired game: Colonization too

Columns

Inspired game: Columns

Command & Conquer

Inspired games: Arrakis, OpenHV, OpenRA, Vanilla-Conquer

Command & Conquer: Generals

Inspired games: OpenSAGE, Thyme

Command & Conquer: Red Alert

Inspired games: Chronoshift, OpenRA, Vanilla-Conquer

Commander Keen Series

Inspired games: Commander Genius, Keen Dreams, Omnispeak, Reflection Keen

Commando

Inspired game: CommandoJS

Company of Heroes

Inspired game: Spring: 1944

Company of Heroes 2

Inspired game: Spring: 1944

Company of Heroes: Opposing Fronts

Inspired game: Spring: 1944

Company of Heroes: Tales of Valor

Inspired game: Spring: 1944

Conflict: Vietnam

Inspired game: Command Series Engine

CorsixTH

Inspired game: Project Dollhouse

Cortex Command

Inspired game: CCCP

Cosmo's Cosmic Adventure

Inspired games: Cosmo-Engine, Cosmore

Counter-Strike

Inspired game: FreeCS

Crazy Machines series

Inspired game: The Butterfly Effect

Creatures

Inspired game: openc2e

Crimsonland

Inspired games: Grimsonland, Violetland

Crossfire

Inspired game: Atrinik

Crusade in Europe

Inspired game: Command Series Engine

Crystal Caves

Inspired game: OpenCrystalCaves

Crystal Quest

Inspired game: CrystalQuest

Cube 2: Sauerbraten

Inspired games: Inexor, Open Cube

CUBE engine

Inspired game: AssaultCube

Cube World

Inspired game: Veloren

Cytadela

Inspired game: Cytadela