mle is described as 'A small, flexible, terminal-based text editor written in C' and is an app in the Development category. There are six alternatives to mle for a variety of platforms, including Linux, Mac, Windows, BSD and Haiku. The best alternative is Vim, which is both free and Open Source. Other great apps like mle are GNU nano (Free, Open Source), GNU Emacs (Free, Open Source), Tilde (Free, Open Source) and Vy (Free, Open Source).
GNU nano is a small and friendly text editor. Besides basic text editing, nano offers many extra features like an interactive search and replace, go to line and column number, auto-indentation, feature toggles, internationalization support, and filename tab completion.
Tilde is a text editor for the console/terminal, which provides an intuitive interface for people accustomed to GUI environments such as Gnome, KDE and Windows. Example: copy current selection is Control-C; paste previously copied text is Control-V.
vy is a modal editor with a very modular architecture. vy is built on top of Tkinter which is one of the most productive graphical toolkits; It permits vy to have such a great programming interface for plugins.
4coder is a minimalist, cross platform, programmable, code editing environment, catering to the needs of low level programmers. It allows you to use one work flow across Windows, Linux, and Mac (with the exception of your debugger... for now.).