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Intellij is written in Swing. Yes on memory hog, no on terrible UI. It works quite well across platforms (I'm using the Windows and Mac version)

• Kwpolska 6y ago
  IntelliJ uses a ton of custom widgets and styles, and nowadays even a custom JVM build to look the way it does. And on Linux, fonts in IntelliJ are hit-and-miss in my experience.
  • beders 6y ago
    I sure hope it uses tons of custom swing widgets. That's something the Java team never got right: the cross-platform look&feels looked just awful.
  • peterashford 6y ago
    Swing was always customisable. You didn't have to use an existing look and feel or built in components