comprehensive: WikiSuite offers most (80%+) of the data and information management features all organizations need
integrated: The end goal is that all parts of WikiSuite look and act consistently. One login for everything, one search box for everything, etc. We are not 100% there yet, but we are closer than the other FLOSS offerings, and have a realistic roadmap to get there. A key reason is that our main web component is the https://tiki.org/FLOSS-Web-Application-with-the-most-built-in-features
Free / Libre / Open Source software (FLOSS): https://en.wikipedia.org/wiki/Free_and_open-source_software
enterprise suitecategory is for solutions for organizations that cover more than 10 traditional software categories in an integrated fashion (ex.: logins work throughout all features, etc.). Software categories differ depending on the source and evolve over time, but here is a typical example.
ever developed: Not vaporware. Please see How to install WikiSuite
According to the Constructive Cost Model (COCOMO), WikiSuite's cost to develop is well over 50 million $USD.
You likely will be interested in the alternatives to WikiSuite.