is there a charge for this app

It would help if you named the apps. Generally, macOS never installs paid apps.

If you just upgraded to Catalina for the first time, macOS 10.13 replaced the iTunes app with individual apps for Music, Podcasts and TV.

For an overview of these changes, see this article: 

What happened to iTunes?

https://support.apple.com/en-us/HT210200

Microsoft Word is not installed by upgrading to macOS Catalina. Yes, it’s a paid app, but you installed it yourself either before, or after the upgrade.

Keynote is free from Apple and has been for many, many years.