OpenTTD is an open-source business simulation game where players build and manage transportation networks to transport passengers and cargo, targeted at fans of classic tycoon-style strategy games.

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🚀 Overview

OpenTTD is a free, open-source reimplementation of the classic Transport Tycoon Deluxe, a 1994 business simulation game. It faithfully recreates the core gameplay of constructing transport empires using road, rail, water, and air vehicles while adding modern enhancements like multiplayer support, modding, and improved graphics options.

The project solves the issue of the original game's age and proprietary nature by providing a cross-platform, extensible alternative that requires no purchase (free graphics/sound packs available). It's built for simulation enthusiasts, strategy gamers, and the modding community who enjoy optimizing logistics networks and competing in multiplayer.

Developed by a dedicated open-source community since 2004, OpenTTD extends the original with features like larger maps, advanced AI opponents, and extensive customization to keep the experience fresh after two decades.

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✨ Key Features

• Cross-platform multiplayer with company invites, no passwords needed, supporting cooperative and competitive play
• Extensive mod support for custom graphics (NewGRF), sounds, scenarios, and AI opponents
• Enhanced world generation: island maps, rivers, waypoints on roads, bridges over stations, manual house placement
• Detailed economy simulation with cargo history graphs for industries and towns, improved UI and settings
• High replayability via random map generation, scripting (Squirrel), and community content
• Optional: Recent additions like FluidSynth support, security fixes, and Steam integration

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🛠 Tech Stack

• Core Engine: C++ (87%), C (9%), Squirrel scripting
• Graphics/Video: SDL (1.2/2, migrating to 3)
• Build System: CMake
• Database: N/A
• Auth: N/A
• Hosting: GitHub Releases, Steam, GOG, official website

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👥 Who Is This For?

This project is useful for:

• Fans of tycoon and transport simulation games seeking a free, updated classic
• Multiplayer groups looking for strategic, long-term logistics challenges
• Modders and developers creating custom content, AIs, or libraries

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📸 Screenshots / Demo

• Live demo: No web demo available; download latest release at https://www.openttd.org/downloads/openttd-releases/latest.html
• GitHub: https://github.com/OpenTTD/OpenTTD
• Steam screenshots: https://store.steampowered.com/app/1536610/OpenTTD/
• Community screenshots: https://steamcommunity.com/app/1536610/screenshots/

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🔥 Project Status

• 🟢 Actively building

Last updated: 2026-03-24

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❓ FAQ

Is this project free?

Yes — Completely free and open source under GPLv2. Download from official site, Steam ($0 often), or GOG. (Requires free OpenGFX/OpenSFX/OpenMSX or original TTD files.)

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Is the source code available?

Yes — https://github.com/OpenTTD/OpenTTD

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Can I contribute?

Yes — Report bugs or feature requests via GitHub issues (https://github.com/OpenTTD/OpenTTD/issues/new/choose), submit pull requests following CONTRIBUTING.md. Join discussions on the forum (https://forum.openttd.org) or Discord (https://discord.gg/openttd).

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📬 Contact & Links

• Website: https://www.openttd.org
• GitHub: https://github.com/OpenTTD/OpenTTD
• Twitter/X: https://x.com/OpenTTDNews
• Email: Use GitHub issues or forum

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