Does anyone have suggestions for personal budget software? I could always cobble something together and I do prefer open source, if not open source at least free is fine. It does not need to have tons of bells and whistles but if it can say do some estimations for the next month that would be good if I were to feed it my income. I guess a spreadsheet in Excel could work too but was hoping for something a bit more than that.

Forgot to include this would be for a Windows system but if there is a Linux version that would be better, especially if it works on both.