scribu

This plugin adds a dropdown with all the plugin author names. When you select an author, only those plugins remain visible.
Links: <a href="http://scribu.net" rel="nofollow ugc">Author’s Site</a>

Filter Plugins

Allows you to quickly filter plugins by author in the admin.

George Stephanis

yoren

jtzl

Tag Filters enhances the plugin management screens in the WordPress admin area by adding the ability to filter plugins by their tags.
On the ‘Add New’ plugins screen, it adds a list of tags that are present in the currently displayed plugins. Clicking on a tag will filter the list to show only the plugins with that tag.
On the ‘Installed Plugins’ screen, it adds a ‘Tags’ column, displaying the tags for each plugin (if they have a <code>readme.txt</code> or <code>package.json</code> with tags/keywords). Clicking on a tag will filter the list to show only the plugins with that tag.

Tag Filters

Customize the Plugins interface enabling tag-based filtering.

Filter Plugins vs Tag Filters