Microsoft Excel. It is better to budget using a hacked-up spreadsheet that matches your workflow, than to have no budget at all. Also, it is installed just abo

Microsoft Excel. It is better to budget using a hacked-up spreadsheet that matches your workflow, than to have no budget at all. Also, it is installed just about anywhere, is very powerful yet easy to learn, allows advanced charting/visualization, and is easy to customize to your heart's content.