AlivePDF is an open source PDF development Kit written by ActionScript based on FPDF. By use of AlivePDF, it could create PDF files by client directly. This Kit use MIT License then very friendly to business user.
It have related very mature open source development kit like Java, PHP, Perl create PDF files. Have used a few and the effect was quite good. But don’t know how about it written by ActionScript 3. I will try AlivePDF later. If you have any comment don’t hesitate to tell me. : )