While IntelliJ is not completely open source, the community edition definitely is(not free in the gpl sense but OSS). But they are careful in marketing it that

While IntelliJ is not completely open source, the community edition definitely is(not free in the gpl sense but OSS). But they are careful in marketing it that way. https://www.jetbrains.com/opensource/idea/ https://www.jetbrains.com/opensource/idea/