Features
Load files from gists
Github Gist give us such a nice API, why not to use it :) It's an awesome way of managing files.
Panels
Editr supports 3 layout views: horizontal, vertical and single. First two are for live edit. Third one is for presentation.
Emmet support
Don't like to spend too much time on typing code? Who does?! That's where Emmet saves our asses.
Rich code editor
ACE Editor is used, it has really wide range of functions and nice syntax highlighting.
Themes
Many, many themes for you to choose from. It's all thanks to ACE Editor usage.
Nice preloader
No nasty looking elements while loading Editr, just a sweet looking preloader which you can customize with css.
Read-only state
Don't want to allow those puny users to edit your code? Switch Editr to read-only mode.
Multiple files
Wants to edit multiple files in single Editr instance? Why not, we have that too.
Base64 support
Don't want to create files? Encode your code with Base64, it works like a charm ... really.
Easy to embed and style
Add single HTML element with demo data and style it with CSS to match your website.
Errors detecting
View CSS, JavaScript errors as you type code.
More features on the way, you can submit your here.
FAQ
There're other web editors, how Editr is different?
Editr isn't for editing and saving files on server, it's for playing with them. It's the same as Codepen or jsFiddle embedded editor, the only difference is that you host your files and you can customize editor.
Can I request a feature?
Sure, if it's useful, I'll work on it. Feel free to send it on Github or just ping me on Twitter but before that, please check if it's not already on features list.
Does it support SASS?
No and it probably won't be. I would love to add support but simply there's no JavaScript parser for SASS.
What about other preprocessors?
As long as they have JavaScript parser, you're free to add support yourself. You can add it via Editr options. Check docs and source.