If you've got a great Web site and want to give visitors a nudge about which parts they shouldn't miss, have a look at Amberjack. It's a handy open source widget that acts as a tour guide for your site.

There's no need to spend hours creating screencasts or hassling with screenshots, just open the wizard and add the URLs of the pages you want highlighted. Amberjack generates HTML code you can drop right into your site.

Microsoft to present open source blueprint for down economy. The company plans to use this week's Open Source Business Conference to outline its next moves.

From open source software to open culture: three misunderstandings. Open processes won't automatically uncover weaknesses and errors.

12 of the best free Linux instant messaging clients. From Pidgin to Psi.

The JavaScript trap. You may be running non-free programs on your computer every day without realizing it—through your web browser.

Arduino hardware hacking--part one. The tiny device that comes with a USB port and programmable chip lets you roll your own devices.

Dojo, one of the leading open-source libraries and widget sets for JavaScript programming, released its latest version (1.2) yesterday. Dojo, which is developed by the Dojo Foundation and released under both the BSD License and Academic Free License, is officially integrated with a number of Web development frameworks, such as Django and the Zend Framework, and by vendors such as IBM and Sun Microsystems.