Converse.js is an instant messaging client for websites. It provides an entirely browser-based Jabber/XMPP interface, and can connect to any XMPP public server. Converse implementes single and multiuser chats, invitations, service discovery, direct registration, contact lists, roosters and vCard exchange, status changes and messages, typing and state notification, and OTR encryption.
Pidgin is a widely-used and featureful instant messenger and chat client. It supports AIM, Bonjour, Gadu-Gadu, Google Talk, Groupwise, ICQ, IRC, MSN, MXit, GroupWise, SILC, SIMPLE, Sametime, XMPP (Jabber), Yahoo!, Zephy. It provides friend lists across chat networks, file transfers, avatars, custom smileys, typing status display, away messages, and many more features (encryption, audio alerts, LED notification, IRC scripting, SMS gateways, sessions, auto-replys) and IM services (Tor, Twitter, Wh