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+# Common Lisp
+Common Lisp is a [Lisp](lisp.md) dialect, created as a successor of MIT's Maclisp.
+
+It also one of the most efficient (in terms of execution speed) Lisp, almost archiving the
+performance of an equivalent [C](c.md) program when using a compiler and type hints.
+
+Unlike other Lisps, Common Lisp is gradually typed: by default its type system is dynamic,
+but it allows to specify the explicit type for a binding, which then a compiler can use
+for compile-time type checking and for producing better [machine code](machine_code.md).
+
+It also allows for [OOP](oop.md) with the included CLOS (Common Lisp Object System).
+
+## Implementations
+- [SBCL](https://www.sbcl.org/) (Steel Bank Common Lisp): a [JIT](jit.md) compiler, seems
+to be the most popular implementation; public domain.
+- [CLISP](https://www.gnu.org/software/clisp/): bytecode interpreter, last release was in 2010 but
+it is still in active development.
+- [GCL](https://www.gnu.org/software/gcl/) (GNU Common Lisp): GNU's Common Lisp compiler, based in Kyoto Common Lisp (KCL).
+- [ECL](https://ecl.common-lisp.dev/) (Embeddable Common Lisp): compiler, also derived from KCL.
+- [CCL](https://ccl.clozure.com/) (Closure Common Lisp).
+- ...
+
+## Examples
+```lisp
+(princ "Hello, World!")
+```
+TODO
+
+## Resources
+- Common Lisp HyperSpec: HTML rendition of the Common Lisp ANSI standard, can be
+found here: <https://www.lispworks.com/documentation/HyperSpec/Front/> with some
+better looking versions here: <https://novaspec.org/cl/> and <https://cl-community-spec.github.io/pages/index.html>.