go
Tail or pipe anything to a web browser
go, redis
A simple Pub/Sub server which streams data to a browser via EventSource
ruby
On demand image scaling server
javascript
A color picker for web browsers based on Raphael
javascript
An Erlang inspired method of namespacing Javascript functions
node.js, pegjs
HTML templates for Node.js based on jQuery Template syntax
java
Application which sonifies network traffic
requires tcpdump
flash
A video player using Flash to display the video, but totally, like, customizable UI created in HTML and Javascript
lua, ruby
Safe HTML templates for Ruby. Uses the Lua programming language to code the templates