I’ve been exploring Emacs vanilla and found some gems. I’ll list those and would like you to list as well in special those that you migrated to from a non built-in package.
- fido: minibuffer completion
- tab-bar: flexible tabs for frames and windows
- desktop.el: saving/restoring sessions
- rgrep: grep recursively
- ibuffer: has filtering functionality
- vc: frontend to git, mercurial, but very limited in comparison to magit