Bygfoot is a football (a.k.a. soccer) management game for Linux and other UNIX look-alikes.
Bygfoot allows you to manage a team by training the players, buying and selling them, contracting loans, maintaining the stadium, etc. You can be promoted or relegated, even become a champion if you're a skillful manager.
The game is deliberately kept simple (though not easy): you only have to keep one eye at your players and another at your stadium.