Am I "allowed" to use the IntelliJ IDEA community edition source to make another IDE?
Is there any open source project to check out to learn by code?
Is there some point should I prefer write IntelliJ IDEA plugin or create new IDE based on IntelliJ IDEA?
The language my IDE should deal with is Java. I want make use of Java editor, debugger and I like IntelliJ IDEA graphical user interface in general.