Ethos Accounting Software - Version 2012.01.01 Ethos Accounting software is a free POS, stock control, accounting & business software application with no limitations or expiry on the free version. Easy to use and install with video tutorials and help files available. The software is a complex and powerful business and accounting solution with a minimalistic and simple interface for users. It is particularly powerful in that it allows users to correct mistakes in historical transactions that will update all related transactions in the system.