From the pkg-descr:

	flpsed is a WYSIWYG pseudo PostScript editor. "Pseudo", because
	you can't remove or modify existing elements of a document. But
	flpsed lets you add arbitrary text lines to existing PostScript
	documents. Added lines can later be reedited with flpsed. 
	
	Using pdftops, which is part of xpdf one can convert PDF
	documents to PostScript and then add text to them using flpsed.
	flpsed is thus useful for filling in forms, adding notes etc.
	
	Warning: flpsed is still alpha software! Make backup copies of
	your files before using flpsed.
	
	WWW: http://www.ecademix.com/JohannesHofmann/#flpsed