Some of these plugins are on my no-brainer list to install in every project. They integrate with WordPress like a charm.
WP Site Aliases
Easily create multiple aliases for your sites & domains
Or browse by category:
WP Spider Cache
Your friendly neighborhood caching solution for WordPress
User Bundle Pro
All user related plugins, in one convenient bundle
LudicrousDB
The ultra-fast database drop-in for WordPress, supporting UTF8MB4, PHP7+, and MySQLi
WP User Groups
Group users together with taxonomies & terms
Post Type Switcher
A simple way to change a post’s type in WordPress
WP User Signups
User signup management for WordPress
WP User Avatars
Allow registered users to upload & select their own avatars
WP User Activity
The best way to log activity in WordPress
Happy customers & industry leaders say...
Felix Arntz
leaves-and-love.net
It’s an interesting model in that every single plugin in here is in the official plugins directory and can be used for free. Or, you can support John by buying a copy from here.
Chris Coyier
css-tricks.com