If you're talking about PDFs with embedded forms, Okular will do that. If you 
just want to write on a PDF, xournal will import and export PDFs and works 
really nicely

On Thu 30 May 2013 23:11:54 Michael Havens wrote:
> I'd swear I asked this but it isn't in the archives. Hans said something
> about acrostar but that was 7 years ago and I was wondering if anything new
> (better)has come about that allows us to input text onto a pdf. (the hans
> comment was in a thread with the words 'fillable' and 'pdf' in the subject)
> 
> :-)~MIKE~(-:
-- 
Ryan Rix
http://rix.si