Trillian is a proprietary multiprotocol instant messaging application. Developed by Cerulean Studios
License: Freemium
Trillian is a user-friendly, multi-protocol instant messaging client with video calling capabilities and a polished interface, making it ideal for personal use. In contrast, Psi+ is an open-source, highly customizable platform favored by developers and technical users, but it may be less accessible for casual users due to its steeper learning curve and less polished design.