We’ve just implemented so that everyone with a uClassify account (free) can access public classifiers.
Once a classifier is published everyone can use it via the GUI or the web API and in return authors get a link to their website from everyone who use their classifiers. This should hopefully inspire more people to share their cool classifiers!
As an example of a published classifier check out the mood classifier by prfekt.se. Here is the list of all published classifiers.