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Copyfree Works

The license status of some works may be more complex than it at first appears here. In some cases, the license status listed for a given work is the "primary" license under which it is distributed. In several cases, parts of the work may be distributed under other licenses -- potentially even non-copyfree licenses.

Where present, descriptions are typically drawn from the claims of the projects themselves, and represent neither claims nor opinions of the Copyfree Initiative. Inclusion here (with or without description) does not constitute, and should not be inferred as, endorsement of any project.

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CHICKENpermalink

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CMU Common Lisppermalink

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CMUCL is a high-performance, free Common Lisp implementation that runs on most major Unix platforms.

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Gauchepermalink

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Gauche is an R7RS Scheme implementation developed to be a handy script interpreter, which allows programmers and system administrators to write small to large scripts for their daily chores. Quick startup, built-in system interface, and native multilingual support are some of its goals.

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Lambrapermalink

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Lambra is an experiment to implement a functional, distributed Lisp on the Rubinius Virtual Machine, much à la Erlang.

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Papertpermalink

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Papert is a Logo implementation that runs in your browser.

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Quicklisppermalink

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Quicklisp is a library manager for Common Lisp. It works with your existing Common Lisp implementation to download, install, and load any of over 1,200 libraries with a few simple commands.

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RSchemepermalink

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RScheme is an object-oriented, extended version of the Scheme dialect of Lisp that compiles to C, or to bytecode for virtual machine execution.

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Scheme 48permalink

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Scheme 48 is a bytecode interpreted implementation of R5RS designed to be used as a testbed for experiments in implementation techniques and as an expository tool.

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Steel Bank Common Lisppermalink

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Steel Bank Common Lisp (SBCL) is a high performance compiler and runtime system for ANSI Common Lisp. It provides an interactive environment including a debugger, a statistical profiler, a code coverage tool, and many other extensions.

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TinySchemepermalink

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TinyScheme is a lightweight Scheme interpreter that implements as large a subset of R5RS as was possible without getting very large and complicated. It is meant to be used as an embedded scripting interpreter for other programs. A lot of functionality in TinyScheme is included conditionally, to allow developers freedom in balancing features and footprint.

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Ypsilon Schemepermalink

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Ypsilon is the implementation of Scheme Programming Language, which conforms to the latest standard R6RS* established in September 2007. Ypsilon achieves a remarkably short GC pause time and the best performance in parallel execution as it implements "mostly concurrent garbage collection", which is optimized for the multi-core CPU system.

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