The number of different applications that use Gecko are ever increasing. What’s Gecko? It’s the rendering engine that powers such programs as Firefox, Thunderbird and many more.

I guess it all starts with Netscape back in 1998 and possibly even before that when Netscape decided to make a technology to power their browser. It’s come a long way and here are a few applications taking advantage of this open source technology.

1. Firefox* – The most popular and most wildly used Gecko application. It’s the little web browser that’s trying to change the world. With hundreds of extensions and themes, customizing it to fit your needs is one thing that makes it so popular.

The other day Hawk Wings tipped us off about a new mail application that is coming to the Mac. It’s called Correo and it’s sound like it has a lot of potential.

Think of it like Camino, the cousin of Firefox that’s Gecko powered, but Mac pretty. Well Correo is the same thing. Gecko powered like Thunderbird, but Mac pretty.

Correo Mail Application Screen Shot Hosted on Zooomr

The current version is 0.1 and it’s off to a great start. It already includes POP & IMAP support, multiple accounts, two or three pained layouts, MacOSX spell check, excellent icons and really, all the basics.