In recent IntelliJ IDEA versions, this information is available directly inside the product (About dialog, click on "open-source software" link).
Third-Party Software Used by Newer IntelliJ IDEA Versions
Third-Party Software Used by IntelliJ IDEA 2018.2
Third-Party Software Used by IntelliJ IDEA 2018.1
Third-Party Software Used by IntelliJ IDEA 2017.3
Third-Party Software Used by IntelliJ IDEA 2017.2
Third-Party Software Used by IntelliJ IDEA 2017.1
Third-Party Software Used by IntelliJ IDEA 2016.3
Third-Party Software Used by IntelliJ IDEA 2016.2
Third-Party Software Used by IntelliJ IDEA 2016.1
Third-Party Software Used by IntelliJ IDEA 15
Third-Party Software Used by IntelliJ IDEA 14.1
Third-Party Software Used by IntelliJ IDEA 14
Third-Party Software Used by IntelliJ IDEA 13.1
Third-Party Software Used by IntelliJ IDEA 13
Third-Party Software used by IntelliJ IDEA 12
See also: