In fact, it's a simple applications catalog with experimental extension for Symbian^3's Java Runtime that makes direct system calls to java installer, giving ability to install and uninstall apps bypassing the browser, obtain list of installed apps and their versions.
Before installing an extension make sure Open4All patch is enabled.
nnhub itself will be updated in future, it will contain new apps and their latest versions.
Open for suggestions of your own developed apps in chat: t.me/nnmidletschat

It was a little late for april fools day i guess