Trident is a web rendering engine developed by Microsoft Corporation. This engine is known for being used to develop browsers, applications, email clients and media players. See below the software that is developed using the Trident engine.

By the way, maybe you are looking for Trident user agents?

Browsers:

• 2345 Explorer
• 360 Secure Browser
• 360 Speed Browser
• Acoo Browser
• AOL Desktop
• Avant
• Browzar
• Crazy Browser
• Deepnet Explorer
• IE
• IEMobile
• JUZI Browser
• KKMAN
• Lunascape
• Maxthon
• Netscape
• QQBrowser
• Sleipnir
• SlimBrowser
• UC Browser

Applications:

• David Client
• Excel
• FrontPage
• Lync
• Office
• OneNote
• PowerPoint
• Second Life Commerce Client
• Word

Email Clients:

• Outlook
• Windows Live Mail

Media Players:

• Zune