title: CAD file Converter Service / Library
body: <p>I need to convert Inventor (.ipt), NX (.prt), SolidEdge (.par), Pro/Engineer / PTC (.prt) and STEP file formats among themselves. (bi-directional)
  Are there any reliable and robust libraries (preferable Java) or (web-)services which can cope with this task and do preserve vendor specific annotations or attributes beside geometric data.
  Additionally it must be executable programmatically and standalone.</p>
  
  <p>So far i have only found</p>
  
  <ul>
  <li>TransMagic (Camtex)</li>
  <li>Direct Translatorv (Elysium Global)</li>
  </ul>
  
  <p>But both are not perfect matches.</p>
  
  <p>Thanks for your help!</p>