Seriously? LibreOffice Calc.


If linux had even a *semi* decent accounting program I believe a LOT more 
companies and individuals would be willing to use linux on the desktop. 
Unfortunately, they all suck. Badly.

http://moneydance.com/ 

Is by far the best, though it is not free and better for personal accounting, 
not for a business. It is getting better at the business side.

GnuCash is an accounting program but it is so complicated to use it is not 
worth the time or hassle. Sorry Mike!

I used one some time ago that was actually really good, but the company made 
it gargantuanly expensive and it competes with Peach Tree accounting software. 

Your last bet is: 

http://www.linuxledgers.com
http://www.ledgersmb.org/
http://sql-ledger.com/

Good luck installing them!