Q: "What's the most interesting program(s) you've seen written with Erlang for business?" A: "That's difficult to answer, there are many good applications. Possibly Ejabberd which is an open-source Jabber/XMPP instant messaging server. Ejabberd appears to be the market leading XMPP server and things like Google Wave which runs on top of XMPP will probably attract a lot of people into building applications on XMPP servers." Builder Australia interviewed Andre Pang in September 2007, and referred to ejabberd in those terms: "the apps that Erlang is suited for really aren't CPU bound that often, if you look at ejabberd, it serves some absolutely crazy amount of concurrent connections, well over 100,000, and they're running it on, I'm not sure, but it's something like a Quad core XEON machine." ejabberd is mentioned in several books related to the XMPP protocol and the Erlang language. XMPP: The Definitive Guide (O'Reilly Media, 2009) refers to ejabberd in those terms: The server is well-known for its scalability, and it can be clustered across multiple instances. A 2006 internal review paper in the IT department of Cambridge University found it the best choice amongst Jabber servers. In the same year Alexey Shchepin was awarded the "User of the Year" award at the 12th International Erlang/OTP User Conference. Other published books that mention ejabberd are: "Programming Erlang: Software for a Concurrent World" (Pragmatic Bookshelf, 2008) "Erlang Programming: A Concurrent Approach to Software Development" (O'Reilly Media, 2009) "Openfire Administration: A practical step-by-step guide to rolling out a secure Instant Messaging service over your network" (Packt Publishing, 2008) "Fedora 11 and Red Hat Enterprise Linux Bible" (Wiley, 2009) ejabberd was used in research works of papers published in international conferences proceedings and journals: XMPP for cloud computing in bioinformatics supporting discovery and invocation of asynchronous web services Kestrel: an XMPP-based framework for many task computing applications IM'ing overload: Libraryh3lp to the rescue Towards an Enhanced Adaptability and Usability of Web-Based Collaborative Systems Leveraging Visual Tailoring and Synchronous Awareness in Web-Based Collaborative Systems Adding New Communication Services to the FIPA Message Transport System There are four patent applications published in the United States Patent and Trademark Office that involve ejabberd: US 2007/0271367 A1: Systems and Methods for Location-Based Social Web Interaction and Instant Messaging System US 2008/0062969 A1: Instant Message Call Connect System Apparatus and Database US 2008/0062970 A1: Instant Message Call Connect System Method and Interface US 2008/0235189