Editing PDFs on Unix/BSD/Linux

Computers make it easier to do a lot of things, but most of the things they make it easier to do don't need to be done. -- Andy Rooney

Programs in the list that follows are free (at least for non-commerical use) at the time of writing.

1. PDFedit
http://pdfedit.petricek.net/en/index.html

2. flpsed
http://flpsed.org/flpsed.html

3. Xournal
http://xournal.sourceforge.net/

4. Jarnal
http://www.dklevine.com/general/software/tc1000/jarnal.htm

5. PDF-Xchange viewer (Use Wine to run this program under *nix.)
http://www.docu-track.com/home/prod_user/pdfx_viewer/

Note: Alternatively, there are many online PDF editors available. You know how to use Google...right? 

If I find other similar applications, I'll append them to this post.