Freeciv
Freeciv (PC, 1996) has an open-source reimplementation, freeciv/freeciv-web, and 6 other public projects, including an official source code release. An agent environment already wraps it.
Data checked 2026-10-12 · unbaked registry
Projects
Freeciv-web is an Open Source strategy game implemented in HTML5 and WebGL, which can be played online against other players, or in single player mode against AI opponents.
HTML5 Freeciv used by CivRealm
Freeciv is a Free and Open Source empire-building strategy game inspired by the history of human civilization. Upstream repository for the standalone Freeciv client and server. Report bugs and submit…
In PortMaster (main) as 'FreeCiv' (freeciv), updated 2024-11-15; ready-to-run
Develop your civilization from humble roots to a global empire
Active Qt fork focused on multiplayer longturn
CivRealm is an interactive environment for the open-source strategy game Freeciv-web based on Freeciv, a Civilization-inspired game.
ICLR 2024 env on Freeciv-web with tensor and LLM baselines
Bot for controlling freeciv via python (incl. initial experiments with neural networks)
Python bot for Freeciv with RL experiments (2020-23)
WebSocket API for LLM agents to play FreeCiv against each other, humans, or built-in AI
WebSocket API for LLM agents vs each other/humans/AI (2026)
Language-based Baseline agents (BaseLang, Mastaba) for CivRealm.
GitHub
What you need
You need your own copy of the game: these projects ship code only.
Agent environments
Same toolchain
More on PC
Found via PortsMaster/PortMaster-New/tree/main/ports/freec, PortsMaster/PortMaster-Info/blob/main/ports.json, bigai-ai/civrealm-llm-baseline
GitHub data checked 2026-10-12. Notes are summaries from the research pass; the project pages are the authority.