Apps similar to Allegro CL include Racket, which is free and open source. Other options are Hy, Rhombus Programming Language, mine IDE and Guile. You can choose from more than 10 Programming Languages like Allegro CL for Windows, Linux, Mac and self-hosting.
GCL is the official Common Lisp for the GNU project. Its design makes use of the system's C compiler to compile to native object code, providing for both good performance and facile portability. GCL currently compiles itself and the primary free software Lisp applications...
LispIDE is a basic graphical shell for several Lisp and Scheme implementations available for Windows. LispIDE seems to work with: Corman Common Lisp, Steel Bank Common Lisp, CLISP, Gnu Common Lisp, Gambit Scheme, Bigloo Scheme, SCM Scheme, Arc, newLISP, OpenLisp, Clozure Common...
femtolisp is a simple, elegant Scheme dialect. It is a lisp-1 with lexical scope. The core is 12 builtin special forms and 33 builtin functions. It is fast, ranking among the fastest non-native-compiled Scheme implementations.
