You know, you're kinda right. Emacs has most of that though. >great language-related facilities for code navigation ectags, Semantic, and various other extens

You know, you're kinda right. Emacs has most of that though. >great language-related facilities for code navigation ectags, Semantic, and various other extensions for various languages >AST-based autocomplete Various autocompleters, including Autocomplete (not AST-based, AFAICT), company mode (which is, I think). >intelligent refactoring CEDET, Semantic Refactor, and various modes for various languages, provide a good bit of this (although it's not up to Java IDE standards). >integrated debugger and build system Check, check, and check. We've got GDB integration, as well as GUD, which can run DBX, SDB, XDB, the perl debugger, PDB, and JDB. integration with make, or any other command-line build tool you want with M-x compile. So yeah, refactoring aside, we're actually pretty well off. And you still don't have org-mode.