Have been building a web IDE & browser based code editor and v2.0 has now launched. Contains a whole load of features beyond just code highlighting such as online & offline use, code completion, type boosting, Emmet, database management, find & replace builder, auto backups, Github syncing and a whole lot more. Oh, and it's free & open source. Any and all feedback welcomed.
This will be really nice for WordPress development, since you bork the whole backend whenever you break some of the core files, such as functions.php (which can be done simply by forgetting a semicolon). Using this should be much easier than logging into cPanel and much more portable than using FTP. Cool beans.
I like all the progress I've seen in web based editors over the years. However, one feature I use a lot in my IDE but have not seen in any web-based editor is code completion. When that gets implemented well, then it will be hard to resist using something this.