IM+ supports simultaneously major IM services, including Google Talk, Twitter DMs, Yahoo!, AIM/iChat, ICQ, Jabber (and Slack through Jabber), etc. Developed by SHAPE Services
License: Freemium
IM+ offers a broader range of platform support and features, making it suitable for users who need to connect across various devices and services. In contrast, Adium, being open-source and focused on macOS, provides a more streamlined experience for Apple users but may lack some advanced features and support for newer protocols.