Top Rated for PyCharm Educational

EmmyLua

Support for Lua programming language.

Custom Postfix Templates

Documentation | Screencast | Predefined templates.

PlantUML integration

PlantUML diagramming tool integration.

GoToTabs

The plugin adds menu actions allowing you to go to a specific tab.

Free MyBatis plugin

Free Mybatis plugin.

LivePlugin

This is a plugin for IntelliJ IDEs to write plugins at runtime without having to restart IDE.

Autoscroll Save

At last, a handy way to save your Autoscroll to/from Source settings :).

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...

hidpi-profiles

Plugin provides possibility to create several UI profiles for different screen resolutions and easily toggle between them.