Freeware is software that is available for use at no monetary cost or for an optional fee,[1] but usually (although not necessarily) closed source with one or more restricted usage rights. Freeware is in contrast to commercial software, which is typically sold for profit, but might be distributed for a business or commercial purpose in the aim to expand the marketshare of a "premium" product. Popular examples of closed-source freeware include Adobe Reader, Free Studio and Skype. This is a list of notable software packages that meet the freeware definition.