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OpenTTD is open source, so not sure that fits.
Older? Check.
Free? Check.
Software/game? Check.
Checks out in my book!
I happened upon the original for $20 in Wal Mart in 1995 and I’ve been playing it on and off ever since!
One of the best games ever made.
I had to google as I was wondering what was so fun about Touch Tone Dialing. I’m old.