Top Rated for IntelliJ IDEA

EmmyLua

Support for Lua programming language.

Save Actions

Supports configurable, Eclipse like, save actions, including "organize imports", "reformat code", "rearrange code", "compile file" and some quick fixes for Java like...

Non Project Files Unlocker

By meo
Disables annoying dialog for unlocking non-project files - IDEA-125379.

ToolWindow Manager

Allows availability of IDEA ToolWindow buttons to be controlled on a per-project basis.

CSS-X-Fire

Connects Firebug CSS editor with any IDE with CSS capabilities (IntelliJ IDEA Ultimate, PhpStorm, WebStorm, PyCharm, RubyMine).

Gerrit

Gerrit Code Review Tool Integration Only Gerrit 2.6 or newer is supported (missing / incomplete REST API in older versions) Features.

Docker integration

This plugin lets you download and build Docker images, create and start Docker containers, and carry out other related tasks.

XPathView + XSLT-Support

The XPath part of the plugin provides a possibility to evaluate XPath expressions against any XML document opened in IDEA.

Zero Width Characters locator

Inspired by this question on Stack Overflow - this plugin adds an inspection that prevents some hard to find bugs related to invisible zero width characters in source...