Depending on how much work you plan on doing you might take a look at QuickBooks, which can do cool stuff like keep track of all the checks you are writing. If

Depending on how much work you plan on doing you might take a look at QuickBooks, which can do cool stuff like keep track of all the checks you are writing. If your on linux might want to try: http://www.gnucash.org/ http://www.gnucash.org/ If you want something simple, try: http://bambooinvoice.org/ http://bambooinvoice.org/ I recommend against writing your own software. (Although we did write our own timekeeping application -- which we license to another local company)