CookiePie is a Firefox extension enabling you to maintain different cookies storage in different tabs and windows. You can open multiple Gmail/Yahoo Mail accounts in different tabs and windows simultaneously. Developers can use CookiePie to test their Web software with different application users without the need to open different browsers.
CHM Reader is an extension to allow Firefox to read Compiled HTML (.chm) files. After installation, with "File | Open CHM File", you can open a CHM file in Firefox. With "View | Sidebar | CHM Reader" or "Ctrl-E", a sidebar that contains topics and an index of the CHM files will be shown.
File-Picker is a program to display and choose files from your Web site. It supports multiple languages. It uses AJAX to allow the user to interact with the server without reloading the page. You can pick several files at the same time. Its visual interface looks like a file explorer.
access.see.be is an accessibility library based on WAI-ARIA. Web developers can use it to enhance their applications with accessible rich interface elements. They can also create full accessible rich Internet applications without excluding users who depend on assistive technologies like screen readers.