Which proprietary software do you prefer over their open-source alternatives, and why?
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Games.
Other than basic things like Tetris (Quadrapassel) and minesweeper, I've not yet found an open source game I've enjoyed nearly as much as the countless proprietary games I own and play.
OpenTTD is the best in its genre if you like that sort of thing... Though it is a reimplementation of originally proprietary software.
OpenTTD is definitely one of the games I played most in my life.
Warzone 2100 is a great open source game, too.