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This is bullshit. People adopt languages because interesting things are made in them. The most interest I've found in lisp has been Emacs, because it's an awesome editor. If more Emacs-level projects in lisp were out there I bet lisp would be more popular. Otherwise, this is just political bravado with no concrete aplication.

'interesting' is a somewhat vague concept. You need either 'interesting for a lot of people' and/or 'easy enough for an implementor who would create such a thing'. It is also important that a programming language and its implementation is used by people who develop new stuff. Currently no large company supports Lisp for that - not Apple (they did that in the 80s), not Google, not SAP, not ... Sometimes they buy technology which has traces of Lisp. Google bought ITA software - they are a Lisp shop. Apple bought Siri, Siri had traces of Lisp in - the original research project was done at SRI, which assembled modules written in many languages - among them Lisp. But that's it.

When display-oriented text editors were developed, very early Lisp programmers implemented them in Lisp and even created engines which were portable for it (the Emacs C part which implements a simple Lisp runtime).

When a CAD company needed an extension language, they added a simple Lisp dialect written in C to their CAD system. Born was Autolisp for AutoCAD - used in millions of installations.

Today there are enough alternative languages around which can be easily embedded - for example Lua.

Common Lisp is slightly more difficult to embed. One either uses ECL (Embeddable Common Lisp) or a home-grown Common Lisp variant. Which for example Quicksilver ( http://www.broadvision.com/en/quicksilver.php ) or PTC's CREO Elements ( http://www.ptc.com/product/creo-elements-direct ) do.

You might never hear of the latter two - they are interesting applications - but not used by that many people.

There are interesting and unique applications written in Common Lisp - but their user domain is very specialized. In music composition you could use OpenMusic, PWGL and several others. In cognitive modelling (used for example to test user interfaces) ACT-R is used. In proving correctness of software something like ACL2 or PVS might be used.

But these are certainly not the interesting applications you have in mind, even though there were probably hundreds of interesting research projects done with something like ACT-R - but it is software for a narrow user group.

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