Top Rated for IntelliJ IDEA Community Edition

GoToTabs

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

Run Configuration as Action

Register all run configuration as actions.

CUBA

This plugin is intended to increase productivity of developers, who build applications on the CUBA Platform.

PlantUML integration

PlantUML diagramming tool integration.

Advanced Java Folding

Modern JVM languages such as Kotlin, Groovy, Scala and some others offer many language features that let you write code in a more concise and expressive manner.

InnerBuilder

Adds a Builder action to the Generate menu (Alt+Insert) which generates an inner builder class as described in Effective Java.

Free MyBatis plugin

Free Mybatis plugin.

Frame Switcher

Plugin for more convenient switching between projects/frames/windows than is alt-tab or Window menu.

Autoscroll Save

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

CloudSlang Plugin

IntelliJ CloudSlang plugin.