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OpenTTD did originally require a copy of Transport Tycoon Deluxe to import its art and sound, but the project now has its own non-copyrighted alternatives. You can download OpenTTD free from Steam for Windows, Mac, and Linux.
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While the official word is that "OpenTTD is not an abbreviation of anything", the Steam page is quite open that it "is an open-source remake and expansion of the 1995 Chris Sawyer video game Transport Tycoon Deluxe." I guess that lingustic shrug is sufficient to avoid the ire of lawyers? As well as supporting modern systems, OpenTTD improves upon the original with larger maps, more building options, expanded multiplayer, and loads of handy new features and quality-of-life improvements.
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