annoyware

from Jargon File (4.4.4, 14 Aug 2003)

annoyware
 n.

   A type of {shareware} that frequently disrupts normal program
   operation to display requests for payment to the author in return for
   the ability to disable the request messages. (Also called nagware) The
   requests generally require user action to acknowledge the message
   before normal operation is resumed and are often tied to the most
   frequently used features of the software. See also {careware},
   {charityware}, {crippleware}, {freeware}, {FRS}, {guiltware},
   {postcardware}, and {-ware}; compare {payware}.

from The Free On-line Dictionary of Computing (8 July 2008)

annoyware

   <software> {Shareware} that reminds you frequently that you
   are using an unregistered copy.

   (1998-04-29)