Emacs - although there's a lot of accumulated cruft in the form of whacky APIs and elisp functions, the
design of Emacs is stunningly effective. The way that minor modes and keymaps are composed to customize the interaction mode for each individual buffer is clever and beautiful, to name just one thing out of many. And, as janky as elisp is, it's one of the few extension languages that's actually good at its job, and the Emacs elisp API allows you complete freedom over virtually every aspect of the editor. Unironically, Emacs is
not a text editor -
it's a toolkit for creating text-oriented applications.
Forth, Lisp (Scheme, in particular - I love CL but it's the C++ of Lisps), and Lua - three languages that take a small set of elegant primitives and synthesize them to give you incredible power.
Remember the Milk is a task-tracking SaaS that is one of the few pieces of software that I actually like, which is especially impressive given that it's proprietary. Cheap, fast, effective, and with a UI design that continually impresses me with its mix of intuitiveness and ergonomics.
Forth, Lisp (Scheme, in particular - I love CL but it's the C++ of Lisps), and Lua - three languages that take a small set of elegant primitives and synthesize them to give you incredible power.
Remember the Milk is a task-tracking SaaS that is one of the few pieces of software that I actually like, which is especially impressive given that it's proprietary. Cheap, fast, effective, and with a UI design that continually impresses me with its mix of intuitiveness and ergonomics.