All of the following under the New BSD license:

"Google Gears (BETA) is an open source browser extension that enables web applications to provide offline functionality using following JavaScript APIs:

*Store and serve application resources locally
*Store data locally in a fully-searchable relational database

GMapCatcher is an offline map viewer utility that allows users to view maps without a need of Internet connection once they are loaded. The application supports many different services:

While I'm a die-hard Google user -- especially the PIM apps -- I still appreciate offline applications for the integration with the desktop, speed, and features they sport.

Here is the script (ubuntu restricted extras offline installer) written by hacktolive.org along with most commonly used packages to make life easier for those who do not have internet connection or those who want to install multimedia codec and other useful packages offline. All the links listed below will direct to the rapidshare and other file hosting sites.

Firefox extension Wired-Marker permanently highlights text on web pages. Unlike web-based highlighters or offline options like previously-mentioned Scrapbook, Wired-Highligher is a hybrid of online and offline highlighting.

Microformats support is one of the most relevant features coming to Firefox 3. It is not one of those instant gratification features like spell checking or tabbed browsing. It’s in the league of offline web applications support, web content handling and live bookmarks

Most Firefox users don't realize that Firefox's current existence is owed almost exclusively to its search partnership with Google wherein Mozilla Corp receives a portion of ad revenue from Google queries initiated from Firefox's search bar. This revenue amounts to tens of millions of dollars.

Popular as Web-based applications are becoming, the fact remains that most of them are tightly tied to the browser. In order to run Google Docs, for instance, you have to access it through a browser like Firefox or IE7. Mozilla Labs is working on Prism, a project it says could make Web apps run with the same ease and efficiency on the desktop as those natively installed on one's hard drive.

Did you know that it's possible to view the content of the biggest and most widely used online encyclopedia without the need for Internet connectivity? That's right, Wikipedia, with over 10 million articles in 253 languages can be viewed offline in your Linux box anytime, anywhere.