Lots of features, standardized, solid standard library, usable for real world programming.
Most popular implementation
It’s embedded and as light-weight as you wish it to be.
Experimental, proprietary variant using LLVM to produce backend code for Android and iOS applications.
An elegant and simple Lisp dialect, frequently chosen as a language to implement for fun and profit.
The official GNU extension language. Not only can it be embedded in an existing project, using it also allows one to compile a supported frontend language to its bytecode. Also usable on its own, thanks to the good FFI there’s more than enough interesting things built with it.
Compiles to C, very good C interop, lots of modules.
Hosts Scheme dialects particularly suitable for education. The #lang feature allows building your own variants easily.
Another Scheme compiling to C, together with SchemeSpheres you get a lot of standard libraries and can develop for mobile and desktop at the same time.
These strive for neither usefulness nor elegance, but rather live on a widely established runtime and encourage interoperation with it. You borrow both strengths and weaknesses of the platform utilized.
The most famous of them all. Runs on the JVM, has some interesting concepts on its own, one of them being Concurrency by STM.
A variant of Clojure compiling to Javascript.
Uses Ruby, looks a lot like Clojure.
Runs on Python, looks a bit like Clojure.
Runs on Perl 5.
Take Lisp and compile it to PHP.
Lisp REPL, interpreter and embeddable sandbox implemented in PHP.
Written by the author of MoonScript in MoonScript, a language that compiles to Lua, just like CoffeeScript compiles to JavaScript.
Lispy frontend to Erlang, completely compatible with existing code.
Another Erlang-powered Lisp dialect which draws inspiration from Common Lisp and Clojure. It’s less powerful (and hopefully simpler to make up for that).
Runs on Bash.
The following don’t fit a particular category.
Implemented on LLVM, tries to be a “wide-spectrum” language by giving one the option to escape to lower-level constructs and data types when needed.
A radical dialect with an emphasis on simplicity in exchange for reduced complexity. Database objects are first class, tunability is especially important.
Very lightweight dialect, embeddable and used by Julialang as compiler frontend.
Surprisingly fun to work with, cool runtime that happens to do lots of things including actually editing text. Great for developing UI demos.
22 Lisp dialects.
Phel (git) is a functional programming language that compiles to PHP