[samsaga2]

- Guile last version: 2.0.11 (2014-03-20) - Ecl last version: 12.7.1 (2012-07-24)

I think guile it's better for language embedding. Anyway if you prefer lisp (to use an asdf package for example) maybe it's better sbcl with ffi.

Chicken scheme it's also nice and very portable.

[lispm]

ECL last version: 13.5.1 http://sourceforge.net/projects/ecls/files/ecls/13.5/

MKCL, fork of ECL Last version MKCL 1.1.9: 2014/07/04 http://common-lisp.net/project/mkcl/

[bachmeier]

> Anyway if you prefer lisp (to use an asdf package for example) maybe it's better sbcl with ffi.

You can't easily embed SBCL inside a C program, can you?

Gambit and Bigloo are also full-featured Scheme variants that compile to C and are therefore easy to embed in a C program.