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This is a plugin that adds support for Elixir to JetBrains IntelliJ IDEA platform IDEs (0xDBE, AppCode, IntelliJ IDEA, PHPStorm, PyCharm, Rubymine, WebStorm).

It works with the free, open source Community edition of IntelliJ IDEA in addition to the paid JetBrains IDEs like Ultimate edition of IntelliJ. No feature is locked to a the paid version of the IDEs, but the plugin works best in IntelliJ because only IntelliJ supports projects with different languages than the default (Java for IntelliJ, Ruby for Rubymine, etc).

The plugin itself is free. Once you have your IDE of choice installed, you can install this plugin.