Trident
Popular Browsers & Applications: Internet Explorer, Avant Browser, Maxathon,
Microsoft Outlook, Outlook Express, AOL Browser
License: Closed-Source
Acid2 Compatible: Yes (in version VI included in Internet Explorer 8)
Acid3 Compatible: No
Operating Systems:
Windows
Major Contributors: Microsoft
Share: Prior to 2004, 95% of browsers on the Internet, now approx 70%.
First Released: April 1997
Gecko
Popular Browsers & Applications: Firefox, Camino, Flock, Thunderbird, Seamonkey, Epiphany, NVU, Netscape, K-Meleon
License: Open-Source
Acid2 Compatible: Yes
Acid3 Compatible: No
Operating Systems: Windows,
Mac OS X, Linux/BSD
Major Contributors: Mozilla Corporation, Netscape (originally)
Share: Approx 20%
First Released: December 1998
WebKit
Popular Browsers & Applications: Safari, Chrome, Adobe AIR, iCab, Epiphany (experimental), Konqueror (KHTML)
License: Open-Source
Acid2 Compatible: Yes
Acid3 Compatible: Yes
Operating Systems: Windows, Mac OS X, Linux/BSD
Major Contributors: WebKit Foundation,
Apple,
Nokia, Adobe,
Google, KDE Team (originally)
Share: Approx 7%
First Released: January 2003 (forked from KHTML, which was first released in October 2000)
Presto
Popular Browsers & Applications: Opera Desktop/Mobile/Mini,
Nintendo DS, Wii Internet Channel, Macromedia Dreamweaver MX and above, Adobe CS 2 and above
License: Closed-Source
Acid2 Compatible: Yes
Acid3 Compatible: Yes
Operating Systems: Windows, Mac OS X, Linux/BSD
Major Contributors: Opera Software
Share: Less than 2%
First Released: November 2002
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Elayidom Blog Archive A quick look at browser engines (Trident, Gecko, WebKit, Presto)