Caret

The Tab key has to be the most underutilized key on the keyboard and Caret just gave it a purpose. It's basically Copilot for everything you type — you hit Tab anywhere and boom, AI kicks in to rewrite, simplify, or generate whatever you're working on. No app switching, no copy-pasting into ChatGPT, just seamless AI everywhere. That's the kind of low-key utility that makes you wonder why no one built it sooner.