I use mostly eclipse, so maybe other IDEs already have it. * Extract superclass/interface which will work on the whole codebase * Support for NVI - rename, cha

I use mostly eclipse, so maybe other IDEs already have it. * Extract superclass/interface which will work on the whole codebase * Support for NVI - rename, change parameters, convert to virtual interface and back * code duplication detection (maybe exists but I never found sufficient one)