#im
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Emoji One
Open source emoji designed for the web. - 
      
        
    
      
      
nodechat.js
Using node.js, backbone.js, socket.io, and redis to make a real time chat appCategories
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Ajax IM
A free, open-source, extensible, customisable instant messaging framework, based on PHP and node.js.Categories
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ruby_bosh
XMPP BOSH session initialiser - 
      
        
    
      
      
Strophe
Javascript XMPP BOSH library - for writing IM clients in the browserCategories
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Userplane Desktop
Cross-platform presence and notification system (in AIR)Categories
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JSJaC
Jabber/XMPP client library written in JavaScript. Can use BOSH or pollingCategories
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Jabber::Simple
Ruby library for Jabber/XMPP - 
      
        
    
      
      
Jive Talks: XMPP (a.k.a. Jabber) is the future for cloud services
Tivo now uses XMPP to update its boxes rather than polling every 15 mins - 
      
        
    
      
      
webmessenger
Documentation for Userplane’s WebmessengerCategories
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Pidgin
Multi-protocol IM client for Windows and *nixCategories
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Is IM better for brainstorming? [than email]
Yes, according to the research in here. Face-to-face always better of courseCategories
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meebo me widget!
IM widget for your websiteCategories
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sabifoo
IM to web/RSS system. APIs etc. - 
      
        
    
      
      
WebORB Message Server Chat (with Google Maps)
GMap sharing Ajax chatting madness - 
      
        
    
      
      
Ajaxian: Chat
Ajax web-based chatCategories
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Building An IM Bot - Part I
A multi-part guide to building an IM bot with ColdFusionCategories