Howl is a general-purpose text editor written and extendable in MoonScript or Lua.
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Pro Easy to use
Howl is very intuitive and easy to use.
Pro Fast startup
It's extremely lightweight, making it start up pretty quickly.
Pro Keyboard driven
You don't need the mouse to use Howl. Everything can be accomplished with commands and shortcuts.
Pro Easy to extend
Plugins (bundles) can be written in Lua or MoonScript.
Pro Open source
Howl is an open source project and is actively developed on GitHub(howl-editor/howl). It has a MIT license.
Pro Language tooling
Has built-in functionality for completion, inline documentation and linting so IDE-like features can be added easily.
Con Lack of Lua examples
Although Howl can be extended in both Lua and MoonScript, almost all bundles are written in MoonScript. This means that it is a bit harder to find examples if you'd rather write your bundle in Lua. MoonScript can be compiled to Lua but the code won't be as clean and understandable as if it would've been written in Lua by hand.
Con Still under development
Howl is still under active development and it's not stable yet. Features may change in the future.