Hello Raoul,
The ACIS module of Open CASCADE does not require an ACIS license. Documentation and pricing will soon be published on the web site. A good way for you to see for yourself how good it is is to send us one or two SAT files and we'll convert them for you. As you can see on the home page of the web site there is a special offer now running concerning translation of SAT files.
Looking forward to hearing from you.
Commenter-1