tldr; light weight Visual Studio for OSX/Windows/Linux with support for dozens of languages, intellisense (autocomplete), refactoring, debugging (yes, real debugging), git integration and it is free
So far on Fedora 21, VSCode is a slow and buggy experience. Atom was never as good as any of the native dev tools that I've used IMO. As a matter of fact, I can't think of one application developed with web tech that performs as well as it's native counterpart.
special request for Rust autocompletion, please!