Sean Egan is a software engineer at Google, where he worked on Google Talk and is currently working on Google Maps.
 He is the former project leader of Pidgin, a popular instant messaging client.
 He is also the author of the book "Open Source Messaging Application Development: Building and Extending Gaim".
QIP ( ; an acronym for Quiet Internet Pager) is a multiprotocol instant messaging client.
 It is a closed source freeware program originally developed by Ilgam Zyulkorneev.
 In 2008 it was bought by RosBusinessConsulting media group and named most popular RBC service in 2009.
Momo (Chinese: 陌陌; pinyin: mò mò) is a free location-based services instant messaging application for smartphones and tablets.
 The app allows users to chat with nearby friends and strangers.
 Momo provides users with free instant messaging services through Wifi, 3G and 4G.
 The client software is available Android, iOS, and Windows Phone.
 Momo Inc. officially began operations in July 2011, and one month later launched the first version of the app for iOS.
Messenger (formerly MSN Messenger Service, .
NET Messenger Service and Windows Live Messenger Service) was an instant messaging and presence system developed by Microsoft in 1999 for use with its MSN Messenger software.
 It was used by instant messaging clients including Windows 8, Windows Live Messenger, Microsoft Messenger for Mac, Outlook.com and Xbox Live.
 Third-party clients also connected to the service.
 It communicated using the Microsoft Notification Protocol, a proprietary instant messaging protocol.
 The service allowed anyone with a Microsoft account to sign in and communicate in real time with other people who were signed in as well.
Cerulean Studios is a software house based in Connecticut, United States, notable for developing Trillian, an instant messaging client.
Trillian is a proprietary multiprotocol instant messaging application for Microsoft Windows, Mac OS X, Linux, Android, iOS, BlackBerry OS, and the Web, created by Cerulean Studios.
 It can connect to multiple IM services, such as AIM, Bonjour, Facebook (Messenger), Google Talk (Hangouts), ICQ, IRC, Extensible Messaging and Presence Protocol (Jabber), VZ, and Yahoo! Messenger networks; as well as social networking sites, such as Facebook, Foursquare, LinkedIn, and Twitter; and email services, such as POP3 and IMAP.
Miranda IM is an open source multiprotocol instant messaging application, designed for Microsoft Windows.
 Miranda is free software distributed under the GNU General Public License.
Morodo is a software based provider of the low-cost and free communication service called MO-Call which includes desktop, mobile and web applications.
 It enables low cost text messaging, low cost international calls and instant messaging services, saving its users up to 90% on phone bills compared to the cost of traditional mobile and fixed operators.
 Morodo’s mobile applications feature direct calling, callback, VoIP and SMS.
 The desktop application features include VoIP, SMS and Instant Messaging
Threema is a proprietary encrypted instant messaging application for iOS, Android and Windows Phone.
 In addition to text messaging, users can send multimedia, locations, voice messages and files.
Ricochet or Ricochet IM is an open source, multi-platform, instant messaging software project originally developed by John Brooks and later adopted as the official instant messaging client project of the Invisible.im group.
 A goal of the Invisible.im group is to help people maintain privacy by developing a "metadata free" instant messaging client.

Question: What is the name of the proprietary multiprotocol instant messaging application that was developed by a software house based in Connecticut, United States?
Answer: Trillian