Lua: The Little Language That Could
Lua's presence is honestly hugely because it is so easy to embed in other programs. If you needed some scripting capabilities, Lua was the way. Whether it's a webserver (nginx) or editor (vim) or a window manager (awesome), Lua was the easiest & best at hand option to integrate.<p>There is a huge opportunity, IMO, for more players here. Deno definitely has some good gestures toward a this. Wasm though seems like the likely general heir, and will have many different offerings for how to do that (Deno being one!).