“Fuck you, Microsoft.” -Everyone, at all times

Eh, that game where you had two gorillas standing on buildings lobbing exploding bananas at each other was pretty cool.

Writer and Impress should cover Word and Powerpoint perfectly. Even if your colleagues use Windows, you can still open them just fine.

Excel though is troublesome, especially those with coded VBA or some plugins from companies. But for basic Excel? Calc can do the job ok too.