OpenGFX provides freely licensed base graphics so OpenTTD runs without original Transport Tycoon assets. One-click installs the official OpenTTD CDN zip into your baseset folder.
Install with the PlayBound Launcher
The launcher installs this into baseset/ for OpenTTD. If the base game is missing, it will install that first.
Install OpenTTD first if you have not already — OpenGFX is an add-on and needs the base game.
The quickest route is the PlayBound Launcher: open OpenTTD, find OpenGFX in its mods list and press Install. The launcher downloads the official release and places it in the right folder for you.
To install it by hand, download the archive directly from https://cdn.openttd.org/opengfx-releases/8.0/opengfx-8.0-all.zip.
Extract the archive into the "baseset" folder inside your OpenTTD installation directory.
Start OpenTTD and enable OpenGFX from the in-game mods or add-ons menu. The download is roughly 10 MB.
Yes. OpenGFX is released under GPL-2.0 and costs nothing. Neither it nor OpenTTD has any paid content.
OpenTTD, which is itself free. OpenGFX is an add-on and will not run standalone.
The PlayBound Launcher installs it in one click from OpenTTD's mods list. You can also install it by hand — full steps are on this page.
Roughly 10 MB, on top of the base OpenTTD installation.