You need Prewikka 5.0.0 or higher.
The git repo for Prewikka apps is available on GitHub and can be cloned like this:
git clone https://github.com/Prelude-SIEM-Contrib/prewikka-apps-inventory.git
Once the source code downloaded:
python setup.py install
Then restart Prewikka. You need to activate it by visiting the "?" > Apps page.
The code is released under the GPLv2 license. See the COPYING file.
Please feel free to propose your own Prewikka apps by submitting a pull request.