One of the more enjoyable browser-based management/tycoon games I've enjoyed over the years has been CS Manager, perhaps better thought of as top-down Counter-Strike in Flash. It was a fun spin on the Half-Life mod that let you create teams with the personalities you wanted, with the strategies you always wanted to run but couldn't.

It's called Cyber Team Manager -- but really, it's a cross between League of Legends and Football Manager.