Trillian is a proprietary multiprotocol instant messaging application.

IM+ supports simultaneously major IM services, including Google Talk, Twitter DMs, Yahoo!, AIM/iChat, ICQ, Jabber (and Slack through Jabber), etc.

FastMail is an email service offering paid email accounts for individuals and organizations.

Conversations is an open source XMPP/Jabber client for the Android platform.

Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application.

Xabber (XMPP and Jabber) is a XMPP client for the Android Operating System.

WeeChat is a free and open-source Internet Relay Chat client, which is designed to be light and fast.