# OpenTTD/OpenTTD

OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe

Repository: https://github.com/OpenTTD/OpenTTD
Canonical: https://ross.abutalabs.com/products/openttd
Homepage: https://www.openttd.org/
Language: C++
License: NOASSERTION
License Family: other
Topics: openttd, simulation, sandbox, game, isometric
Last push: 2026-08-26T20:07:05+00:00

## Health v2 (maintenance only)
Score: 92/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 78, longevity 100
- inputs: {"age_days": 3071, "days_push": 7, "days_rel": 151, "gap_med": 24, "n_releases_24m": 4}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 8208, forks 1253 (observed 2026-08-28T04:10:19.576936+00:00)

## What it is
OpenTTD is an open-source transport simulation game based on Transport Tycoon Deluxe, written in C++. It extends the original game with larger maps, stable multiplayer for up to 255 players, dedicated servers, and extensive modding support via NewGRF add-ons.

## Use cases
- play a transport empire simulation game
- run a multiplayer transport tycoon server with friends
- play an open-source remake of Transport Tycoon Deluxe
- mod a simulation game with custom graphics and vehicles
- build rail, road, ship, and air networks in a sandbox game

## When to choose
- you want a deep, actively maintained transport simulation with multiplayer and mod support
- you want a free, cross-platform game with dedicated server support
- you want to extend gameplay with community-made NewGRF add-ons

## When to avoid
- you need a modern 3D game engine or realistic graphics
- you want a casual mobile-style game rather than a complex management sim
- you need a game engine or library to build your own game rather than a finished game

## Facets
- artifact type: application
- maturity: stable
- function: game-engine, simulation, gui, networking
- domain: simulation, gaming-tools, entertainment, cross-platform
- platform: windows, bsd, cross-platform
- tags: transport-tycoon, isometric-graphics, multiplayer, sandbox-game, open-source-game, newgrf-mods, dedicated-server, game-development, linux, macos, desktop

## Member repositories
- OpenTTD/OpenTTD (main) score 92

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:19.576936+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:29:32.880767+00:00, confidence not recorded.
  - readme: https://github.com/OpenTTD/OpenTTD (fetched 2026-08-28T04:10:19.576936+00:00, sha 4d5481cbe954)
  - homepage: https://www.openttd.org/ (fetched 2026-08-29T08:28:13.919710+00:00, sha 759c0d299d25)
  - site_page: https://www.openttd.org/about.html (fetched 2026-08-29T08:28:13.925751+00:00, sha e7e6d34f5a2a)
  - site_page: https://www.openttd.org/downloads/openttd-releases/latest.html (fetched 2026-08-29T08:28:13.922249+00:00, sha d6f76b89fb8c)
  - site_page: https://www.openttd.org/downloads/openttd-releases/testing.html (fetched 2026-08-29T08:28:13.924071+00:00, sha e4134220fd49)
- Data as of 2026-08-30T08:39:29.467469+00:00.