I've been writing Free Software, specifically GNU Emacs plugins for years now. I maintain popular packages such as Ivy/Swiper/Counsel, Hydra, Avy, Lispy, and many more.
Ivy - a generic completion frontend for Emacs, Swiper - isearch with an overview, and more. Oh, man!Emacs Lisp 1.4k
make Emacs bindings that stick aroundEmacs Lisp 1.1k
Jump to things in Emacs tree-styleEmacs Lisp 945
Short and sweet LISP editingEmacs Lisp 677
Quickly switch windows in EmacsEmacs Lisp 530
Drag and drop images to Emacs org-modeEmacs Lisp 403