freeware vs presentation software

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. 

presentation software

noun
  • A computer software package used to display information, normally in the form of a slide show. 

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