There are many different football videogames to suit all tastes: some like soccer simulators where you get to play actual games on field, while some others prefer a more strategic approach, that is, managing the team as a coach.
The latter will probably like Bygfoot Football Manager, an open-source football management game that puts you in control of a football team during the league season. As a coach/manager, you'll be in charge of training sessions, contracting new players, selling other players and defining team's strategy in order to succeed both in league and other football competitions.
Being an open-source project, you shouldn't expect high-res graphics or amazing physics. In fact, the game barely shows any animations as it's all controlled through windows and menus. However this should not be a problem for hardcore football manager fans who doesn't care that much about the realism of graphics, but about the gameplay in itself. In that sense, Bygfoot Football Manager is going to surely please them.
Bygfoot Football Manager doesn't have brilliant graphics or jaw-dropping physics, but as a classic football manager it proves to be quite complete and very entertaining.