What Adobe Acrobat alternatives have PDF signing features

Question

We use Adobe Acrobat at work for creating signed PDF documents. Currently run Adobe Acrobat 6 Professional to sign these documents. Acrobat Reader will not sign PDFs. Is there any non acrobat product that can:

1) Sign PDFs 2) Add signature fields to PDFs.

The first is more important than the second since I sign PDFs more than I insert signature fields in PDFs.

Answer 1

OpenSignPdf is an open source project for the digital signature of PDF documents.

I'm not sure it this is a good idea, but there is experimental online PDF signing service.

Answer 2

jpdftweak, although I never tested signing with it.

If you want to do it from a program, look at iText.

Answer 3

Have you tried foxit reader and creator?

Answer 4

You have also Portable Signer that does PDF signing, and is multi platform. It is based on the iText library.

Answer 5

pdfMachine pro does digital signatures. They will also sell you a certificate if you want.