What becomes interesting, though, is taking these ready-built components and trying to improve on the paradigm and the user experience.
With Plunker (which was originally inspired by jsFiddle and some of its short-comings) I've been trying to build tools around the core experience to make prototyping easier for the modern web developer.
Something that you won't find anywhere else is Plunker's package catalogue [1]. What is particularly unique about this is that it allows you to quickly find and 'insert' package dependencies into your markup in a way that resolves dependencies and in a version-aware fashion. These packages can be combinations of js and css. The web-based-IDE lets me take an approach that isn't viable for offline alternatives like bower and component but that is much easier from the user's perspective. A side-benefit of this approach is that all templates on Plunker can be made to auto-update to the latest (matching semver) version when they are opened or on-demand.
As I continue working on Plunker, this is the sort of feature that I hope will help it distinguish itself from the hordes of look-alike clones. Right now, I'm working on a new UI for the editor to allow a more flexible approach to editing files in a column/row grid [2].
