OPEN SYSTEMS Accounting Software (OSAS) is a business accounting software

Accounting software

Accounting software is application software that records and processes accounting transactions within functional modules such as accounts payable, accounts receivable, payroll, and trial balance. It functions as an accounting information system...

 package for small- to medium-sized businesses using the Microsoft Windows

Microsoft Windows

Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...

, Linux

Linux

Linux is a Unix-like computer operating system assembled under the model of free and open source software development and distribution. The defining component of any Linux system is the Linux kernel, an operating system kernel first released October 5, 1991 by Linus Torvalds...

, and Mac OS X

Mac OS X

Mac OS X is a series of Unix-based operating systems and graphical user interfaces developed, marketed, and sold by Apple Inc. Since 2002, has been included with all new Macintosh computer systems...

 operating systems. First sold in 1976, it has been actively developed and sold since then by Open Systems, Inc. of Shakopee, MN.

OSAS is currently programmed in the Java-based BBj

BBj

BBj is a software development framework which consists of a dynamic programming language by the same name, an integrated development environment, a GUI forms designer, a Rapid Application Development tool called for generating database-driven graphical applications.BBj is Java-integrated and...

 language developed by BASIS International

BASIS International

BASIS International Ltd. is the developer and supplier of the BBx and BBj interpreted programming languages derived from Business BASIC. In 1985, BASIS released BBx , their first generation of Business BASIC. The fifth generation product includes PRO/5 for UNIX/Linux and Visual PRO/5 for Microsoft...

. The Java implementation allows installation of OSAS on a variety of platforms.