Open Systems Accounting Software

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OPEN SYSTEMS Accounting Software (OSAS)
Developer(s) Open Systems, Inc.
Stable release
November 1, 2010 (2010-11-01)
Operating system Windows XP or later, Linux, Mac OS X
Type Accounting software

OPEN SYSTEMS Accounting Software (OSAS) is a business accounting software package for small- to medium-sized businesses using the Microsoft Windows, Linux, and Mac OS X operating systems. First sold in 1976, it has been actively developed and sold since then by Open Systems, Inc. of Shakopee, MN.[1]

OSAS is currently programmed in the Java-based BBj language developed by BASIS International.[2] The Java implementation allows installation of OSAS on a variety of platforms.[3]


  1. ^ Fineberg, Seth (April 4, 2004). "Open Systems Still Stands the Test of Time". Accounting Today.
  2. ^ "Open Systems Releases OSAS 7.0". (December 28, 2005). WebCPA Daily.
  3. ^ Scott, Robert W. (August 31, 2007). "Opening for Open Source?". Accounting Technology.


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