Term: foistware

Foistware is additional software “foisted” on an unsuspecting user when some other software is installed.

The most common example of foistware might be additional toolbars and search add-ons that often accompany free software downloads. Foistware may, or may not, include an option to be installed, but often installs without asking.

See also: shovelware, crapware, craplet.