The time is ripe for a tool that integrates knowledge management and development with this "linked outline" structure; it's an upgrade over the classical folder

The time is ripe for a tool that integrates knowledge management and development with this "linked outline" structure; it's an upgrade over the classical folder-based storage of files. There have been previous attempts to create integrated editors for semi-structured information both from the software (Code Bubbles) and documentation (Haystack project, Chandler) perspectives. Machines are now powerful enough for them to become useful and responsive (as these environments consume huge amounts of memory). For such a tool to become widespread though, it will need to be based on user-friendly design, and be able to share content on the web. Evernote and Workflowy come to mind as tools with those properties, but they don't handle code execution; and reactive, live programming tools like jsfiddle don't allow for outline-like structuring. It would be great if such a tool was also Open Source, but that's unfortunately not a pre-requisite for success; I imagine Google or Apple will be the first to build such development environment, or to buy a start-up that build it and turn it into an standard.