Flpsed is a WYSIWYG PostScript2 annotator.
You can't remove or modify existing elements of a document.
But flpsed lets you add arbitrary text lines to existing PostScript 2 documents.
Added lines can later be reedited with flpsed.
Using pdftops, which is part of xpdf one can convert PDF documents to PostScript
and also add text to them. flpsed is useful for filling in forms, adding notes etc.
This package is linked statically against fltk.