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+ is a versatile messaging app that supports multiple platforms and offers built-in voice and video calls, while Riot.im (now known as Element) prioritizes privacy and federated communication with a focus on open-source principles. The choice between them largely depends on user needs for either cross-platform convenience or privacy-focused communication.