| abcl | Armed Bear Common Lisp is a Common Lisp implementation for the JVM |
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| alexandria | A collection of portable utilities for Common Lisp |
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| asdf | ASDF is Another System Definition Facility for Common Lisp |
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| c2ffi | Clang-based FFI wrapper generator for Common Lisp |
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| clisp | Portable, bytecode-compiled implementation of Common Lisp |
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| clozurecl | Common Lisp implementation, derived from Digitool's MCL product |
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| cl-ppcre | CL-PPCRE is a portable regular expression library for Common Lisp |
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| cl-ppcre-unicode | CL-PPCRE is a portable regular expression library for Common Lisp |
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| cl-unicode | Provides Common Lisp implementations with knowledge about Unicode characters |
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| clx | CLX is the Common Lisp interface to the X11 protocol primarily for SBCL |
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| cmucl | CMU Common Lisp is an implementation of ANSI Common Lisp |
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| ecl | ECL is an embeddable Common Lisp implementation |
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| flexi-streams | Flexible bivalent streams for Common Lisp |
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| gcl | GNU Common Lisp |
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| hyperspec | Common Lisp ANSI-standard Hyperspec |
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| roswell | A lisp installer and launcher for major environment |
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| sbcl | Steel Bank Common Lisp (SBCL) is an implementation of ANSI Common Lisp |
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| trivial-gray-streams | A thin compatibility layer between Gray Stream Common Lisp implementations |
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| uiop | UIOP is a portability layer spun off ASDF3 |
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