OPaC is a class library project which has been killed when Microsoft released .NET.
This page is still under construction ! Sorry, visit again later. Old pages are here (completely outdated).
Preliminary draft documentation :
There is no longer anything to download, since the effort of keeping things up-to-date is not worth it. Since Virtual Pen was killed too (and it no longer uses OPaC), nothing new will emerge here.
However, if you are curious, here is a prototype drawing program for Win32, called PagePC, which was developed jointly by Daniel Roux and Pierre Arnaud (me). It is based on OPaC for the GUI and on Ghostscript for the rendering. It is a dead project too, alas.