Xenforo

This add-on allow you to offer your users a gallery of pre-selected avatars to use.

The plugin allows you to add a light or dark colored button to the navigation area.

The plugin allows to pin the sidebar.

This add-on adds sticky value to the approval queue controls so it's easier to moderate for example

Show nodes as grid with some extra features.

Add account menu items to a widget in different ways with optional bookmarks.

a light, modern theme

UserCheck blocks users from registering with disposable/temporary email addresses.

Novus is a theme with a professional color scheme which is very simple to modify via a single Style

Empire is style for people who like to show something more on their forums than just empty nodes.

The plugin allows you to quickly tag users in a post.

This mini Addon, adds full display of third-party content attachments

The plugin allows you to display user banners sequentially.

Easily create a widget homepage like a portal page.

Carbon, named after the carbon texture which is used throughout the design,