Software and Tools for one person owned business [closed]

"If you open to using Gnome, have you considered GnuCash? I've used it for myself, but my needs are very basic, so YMMV. It's laid out according to the typical simple gnome style, but I found it very useful for invoicing especially. Reads QIF if you're exchanging with quickbooks or your bank.

You can use it like you'd use a checkbook:

But you can orgainize you data any way you like:"