What's known as plugin or addon in other platforms, is what we call a in the universe. Drupal core itself is a a collection of modules as well and the community has added and maintains tens of thousands of individual modules on top of that.

Avoid self-definition in taxonomy term description when using the Onomasticon module

Submitted by Richard Papp on Tue, 01/24/2017 - 20:08
The 8 Onomasticon automatically displays the definition of taxonomy terms everywhere a term is used. However, you may want to avoid self-definition on the term's own page as its description is already visible without it.

CKEditor Abbreviation

for adding and editing abbreviations in Wysiwyg CKEditor.

User Hash

The User hash allows you to create an individual hash for each user. Use it as a light-weight user identification where you do not want to use the login credentials. E.g. as an individual API Key for reading insensitive content.