OpenTTD is an open source simulation game based upon the popular Microprose game "Transport Tycoon Deluxe", written by Chris Sawyer. It attempts to mimic the original game as closely as possible while extending it with new features.
TTD has taught me how to love again. Not only is this game one of the best ever made, but will they ever make a game like it? ever? And it's free! I love you guys.
Very accurate to the original, but now with better trains and signals! Signals that show green all the way into my heart.