freeware vs groupware

freeware

noun
  • Complete and functional software that does not require payment or other compensation (such as viewing advertising) for its use. Freeware may be a proprietary license with no access to the source code. 

groupware

noun
  • software designed to be used collaboratively by multiple users on a network 

How often have the words freeware and groupware occurred in a corpus of books? (source: Google Ngram Viewer )