LispWorks is computersoftware, aproprietary implementation andintegrated development environment (IDE) for theprogramming languageCommon Lisp. LispWorks was developed by the UK software companyHarlequin Ltd., and first published in 1989.^[1] Harlequin ultimately spun off its Lisp division asXanalys Ltd., which took over management and rights to LispWorks. In January 2005, the Xanalys Lisp team formed LispWorks Ltd. to market, develop, and support the software.

LispWorks's features include:

• A native-code compiler and an interpreter for an extended ANSI Common Lisp
• An implementation of theCommon Lisp Object System with support for themetaobject protocol
• Support for32-bit and64-bit versions
• Nativethreads andsymmetric multiprocessing
• Unicode support: it can read and write files, and supports strings, so encoded
• Foreign language interface (FFI) to interface with routines written inC
• AJava interface
• Thecommonapplication programming interface (CAPI)graphical user interface (GUI) toolkit, which provides native look-and-feel on Windows,Cocoa,GTK+, andMotif
• AnEmacs-like editor; source code is included in the Professional edition
• A Lisp Listener,^[2] which provides a Common Lispread–eval–print loop (REPL)
• A graphicaldebugger,inspector, stepper,profiler,class browser, etc.
• A facility to generate standalone executables and sharedlibraries; to reduce memory size, a tree shaker can be used to remove unused code and data
• OnmacOS, it provides a bridge toObjective-C for using Apple'sCocoa libraries
• Many of the libraries are written using theCommon Lisp Object System (CLOS) and can be extended by the user, by writing subclasses and new methods

The Enterprise edition also includes KnowledgeWorks, which supportsrule-based orlogic programming (including support forProlog); the CommonSQL database interface; and aCommon Object Request Broker Architecture (CORBA) binding.

In September 2009, it was announced that LispWorks 6 would supportconcurrentthreads and the CAPI graphics toolkit had been extended to supportGTK+.^[3] LispWorks 6.1, released in January 2012,^[4] included many further enhancements to CAPI, such as support for anti-aliased drawing.

LispWorks ran on thespacecraftDeep Space 1. The application calledRAX won the NASA Software of the Year award in 1999.^[5]

• Allegro Common Lisp

• Common Lisp implementations
• Common Lisp (programming language) software
• Lisp (programming language)

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