Can we migrate WordPress CMS database to any other CMS?

[B.Ali]

If the database is based on WordPress CMS can we migrate to any other from it? If yes how and does it cost?

[M.A.A]

Depends on what you are going to do with it.
WordPress Database can be converted into anything you want, one needs to have a good know how of both WordPress & the script's DB you are going to convert your site into. Simple set of queries and Booyah!

Costing? It depends upon where you are going to shift your DB.