CherryMusic is a music streaming server based on CherryPy and jPlayer. It plays the music inside your PC, smartphone, tablet, toaster or whatever device has a HTML5 compliant browser installed.
TiddlyWiki is a complete interactive wiki in JavaScript. It can be used as a single HTML file in the browser or as a powerful Node.js application. It is highly customisable: the entire user interface is itself implemented in hackable WikiText.
It is a simple, fast and small file manager with single php file. It is also a web code editor. It'll run either online or locally, on Linux, Windows or Mac based platforms.