OPEN SYSTEMS Accounting Software OSAS is a powerful, award-winning accounting and business management system that is flexible and easy to customize to your requirements. Built on a tradition of success, OSAS is designed to be easy to learn and use. A proven industry leader, OSAS will help meet your needs and expectations now and in the future.

OSAS provides these key advantages

Robust Functionality - We have over 25 years of experience in providing award-winning business solutions and incorporating feedback from real-world users.


Open Source Code - We provide source code for our applications at no additional cost. We do this to protect your investment in our technology, as well as encourage customization that will support your unique needs and changing market conditions.