Track running on elliptical or treadmill?

I have an elliptical machine that I need to be using at home. I would love some app that I could manually enter in my distance and time and it could track over time how far I've gone. Maybe do graphs kind of like Nike+. It doesn't need to actually measure anything just let me manually enter in information. I guess it wouldn't even need to be an iphone app, maybe just some os x software. Does anyone know of anything like that? I haven't been able to find anything.