DWOS 2.5.0.10431 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions of the DWOS are 2.5 and 2.1. This software is an intellectual property of Dental Wings inc. We recommend checking the downloaded files with any free antivirus. The program lies within Education Tools, more precisely Science Tools.
From the developer:
DWOS includes a complete suite of design applications and features which enable dental technicians and GPs (General Practitioners) to design an extensive range of prosthetic indications using one common software platform. This powerful architecture is made accessible through a simple, dental related interface.
You may want to check out more software, such as Dream World Online, which might be similar to DWOS.