Top Rated for PyCharm Professional

Grammar-Kit

BNF Grammars and JFlex lexers editor.

Tab Shifter

This is a plugin with a bunch of actions to move tabs between editor splits and resize splits. Actions are added to "Main Menu -> Window -> Tab Shifter".

Wolfram Language

A plugin for Wolfram Language development.

RIPS Security Analysis

RIPS is a static code analysis software that automatically detects critical security issues in PHP/Java code with data flow analysis.

CodeMR

CodeMR is a software quality and static code analysis tool for Java, Kotlin and Scala projects.

Spacegray Theme

Spacegray theme for IntelliJ, inspired by one made by Gadzhi Kharkharov for SublimeText.

Integration for SAP Commerce

This is an unofficial community maintained plugin for SAP Commerce (previously Hybris) integration within IntelliJ IDEA.

Kubernetes

Support for editing Kubernetes resource files (versions 1.5 - 1.14).

CSS-X-Fire

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

MicroPython

Support for MicroPython devices in IntelliJ IDEA and PyCharm.