A new-generation text editor that seems geared toward programmers. Draws heavily from vim in certain UI/UX respects.
This is "Vim Online", a vim editor in browser. It's an online vim editor that allows you can install your vimrc, and this app will remember your vimrc between visits to a vim editor online.
While those projects did a great job getting started on an online vim editor, there are still many missing pieces. The most important missing feature in my opinion is being able to install a vimrc to your vim editor online get back all the keybindings you're used to. Another really important missing feature of a vim editor online is being able to save files easily and navigate between files easily.
What would really be cool is being able to edit files from the filesystem, using the WASI API. Even if direct access to the filesystem isn't possible, an autosync with the source code so that you could easily test the code would be super cool.
GNU Zile is a text editor development kit, so that you can (relatively) quickly develop your own ideal text editor without reinventing the wheel for many of the common algorithms and data-structures needed to do so.
It comes with an example implementation of a lightweight Emacs clone, called Zemacs. Every Emacs user should feel at home with Zemacs. Zemacs is aimed at small footprint systems and quick editing sessions (it starts up and shuts down instantly).
Zile is a collection of algorithms and data-structures that currently support all basic Emacs-like editing features: it is 8-bit clean (though Unicode support is not ready yet), and the number of editing buffers and windows is only limited by available memoryand screen space respectively. Registers, minibuffer completion and auto fill are available.