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 various platforms and offers advanced features like voice and video calling. Nimbuzz, while also supporting multiple platforms and offering group chat, is ad-supported and may have a less stable connection.