Mostly useful for people who use Chrome, but most of these undoubtedly have analogues or versions in Firefox. A lot of good extensions for news, productivity and research, plus some stuff that's just plain cool.
While this website is helpful, many of the apps do not seem to be useful to everyday browsing, excluding a few in the Education section of the article. Granted, I still went and downloaded a lot of those apps because, as Nathan said above me, they're pretty cool.
Browser extensions are definitely neat -- all the browsers have them now, pretty much. Firefox was the first browser to be extensible like this, so there tend to be a lot of extensions available for it. Zotero, which we're going to learn about next week, started out as a Firefox extension.
I thought about defining "extension" in core concepts, but it's maybe a little more advanced than that. Extensions (also called "add-ons" and "plugins") are basically little apps that "plug in" to a big app.
Rather is a new service that helps you block key words you would rather not see on your facebook newsfeed. It is just an extension in the Google Chrome browser.
I think it's done in HTML5, which may be why I don't get any sound for it in Chrome -- not all browsers can manage all features of the new, drastically revised version of HTML yet.
These are different app for computers that will help you concentrate on your work rather than being on sites that you shouldn't be. Currently I am using the StayFocused chrome extension to block certain sites when I am working.