Free javascript encoder software for linux

pypng 0.0.9 is an excellent and must-have product which offers you a Python module to decode (read) and encode (write) PNG files. All PNG formats are supported. Pure Python so that it can be installed as easily as possible and used on different Python implementations.

Spket IDE project is powerful toolkit for JavaScript and XML development.
The powerful editor for JavaScript, XUL/XBL and Yahoo! Widget development. It provides features like code completion, syntax highlighting and content ouline that helps developers producitively create efficient JavaScript code.
Enhancements:
- A JavaScript Formatter was added for making code pretty.
- Syntax highlighting was added for Server Side Script.
- Other minor bugfixes and feature enhancements were made.

YesScript Firefox extension is a JavaScript blacklist.

JavaScript is not something to be feared. Firefox is the most secure browser, and any vulnerabilities found are patched within days. However, JavaScript is sometimes misused by sites. They can show obtrusive ads or try to limit built in browser functions such as the back button or the right-click menu. Poorly written scripts can also hog your systems resources.

YesScript provides a JavaScript blacklist, letting you specify which sites arent allowed to run JavaScript. A single click on the status bar icon can put the current site on the blacklist or take it off.

qooxdoo is an advanced open-source javascript based toolkit. qooxdoo continues where simple HTML is not enough anymore.

qooxdoo can help you to get your rich web application interface done much easier than ever before.

Freejtv HTML/Javascript Slideshow Template is a cross-browser, cross-platform HTML/Javascript template page for building your own slideshow and gallery. The project supports more than 30 DirectX transitions in the IE browser and fade in/out transition in Firefox.
Howto:
Press Simple Slide, Effect Slide and Collage Slide on top menubar to generate your own thumbnail photo album and music photo presentation (NO demo versions restriction or other functional limitations). Its a self-aid free service (based on Java applet, 1.4.2 or higher is required).
Nowadays a lot of free web hosting services provide free subdomain web space (100-500M space, 5G-20G bandwidth/Month, 500K filesize limit, PHP support, Zero cost for 1 year). You can upload the generated thumbnail gallery and the slide page to any web spaces. If the photos are too large, you can press the Image Processing on top menubar to reduce the filesize of a group of jpeg files. Its much easier than using photoshop to save them one by one.
Problems:
The most common error is caused by applets cache. For efficiency, applet and application data are cached and sticky in a directory other than browsers cache. If the applet could not work correctly, you should open the java plugin control panel and empty the cache first.
Error could also be caused by proxy. As this site is powered by services from Blogger, Googlepages and Myjavaserver, users should make sure that the browser could visit the 3 sites. Since applet may use a network connection different from browsers, users should make sure that the applet could visit all the three sites too. Applets network connection could be set from java plugin control panel.
If it still could not work, email the java consoles output to me.
Enhancements:
- Background music playing is improved in Firefox and Safari.
- This release works with Safari correctly.
- Music pause/resume support has been added.
- The documentation has been revised.

Simple Spreadsheet is a webbased spreadsheet program written in Javascript, HTML, CSS and PHP.

Simple Spreadsheet features formulas, charts, numeric formats, keyboard navigation, etc. Javascript is used for the default data format and for the macros and formulas.