S Hetjens

This plug-in restricts access to blog and feed. All anonymous visitors will be forwarded to the login page of WordPress 
before accessing the blog content. If access is restricted, rss and atom feeds will be disabled, too.
The feed can be activated as a private feed for each user. Every user will have a unique feed url to access it. That 
url is based on the username and an md5 hash of the hashed password stored in database. This plug-in will modify all 
by wordpress inserted feed urls to the user specific ones. But be carefull. If you content is confidential you should 
not activate the feed. There is no way to check which services are reading (and maybe publishing) the feed’s content.

Hetjens Registered Only

This plug-in restricts the access to blog and feed. Visitors need to login before accessing the blog. It offers a private feed for every user.

konnektiv

chherbst

This GamiPress Add-on adds a shortcode to show a link. The user is then awarded a specified achievement when the link is clicked. This shortcode is fully integrated with the GamiPress shortcode insert button.
Note: You need to install the free <a href="https://wordpress.org/plugins/gamipress/" title="GamiPress" rel="ugc">GamiPress plugin</a>™ (version 1.4 or higher) to use the GamiPress Community Add-on. The Plugin was tested up to GamiPress 1.9.1
<a href="https://wordpress.org/plugins/gamipress/" title="GamiPress" rel="ugc">Get the GamiPress plugin</a>.
This plugin was originally developed for the <a href="https://www.giz.de/akademie/en/html/index.html" rel="nofollow ugc">Academy of International Cooperation</a> of <a href="https://www.giz.de" rel="nofollow ugc">GIZ</a>.
<h4>Contact</h4>
<ul>
<li><a href="https://konnektiv.de/" rel="nofollow ugc">Konnektiv</a></li>
</ul>

Award On Click Add-On for GamiPress

This GamiPress Add-on adds a shortcode to show a link. The user is awarded a specified achievement when the link is clicked.

Hetjens Registered Only vs Award On Click Add-On for GamiPress