GNU Common Lisp         (EmcsT, SrcCD)

GNU Common Lisp (GCL) has a compiler and interpreter for Common Lisp.
It is very portable and extremely efficient on a wide class of
applications.  It compares favorably in performance with commercial Lisps
on several large theorem prover and symbolic algebra systems.  It
supports the CLtL1 specification but is moving towards the proposed ANSI
definition.  It is based on AKCL and KCL.  KCL was written by Taiichi
Yuasa and Masami Hagiya in 1984, and AKCL has been developed by William
Schelter since 1987.

GCL compiles to C and then uses the native optimizing C compilers (e.g.
GCC).  A function with a fixed number of args and one value turns into a C
function of the same number of args and returning 1 value, so it cannot
really be any more efficient on such calls.  It has a conservative GC which
allows great freedom for the C compiler to put Lisp values in arbitrary
registers.  It has a source level Lisp debugger for interpreted code, with
display of source code in the other Emacs window.  It has profiling tools
based on the C profiling tools, which count function calls and percentage
of time.  CLX works with GCL.  There is an Xlib interface via C.  PCL works
with GCL.  *Note Forthcoming GNUs::, for plans for about GCL.

GCL version 1.0 is being released under the GNU Library General Public
License.  (FTP `/pub/gnu/gcl.README' on `prep.ai.mit.edu'.)  Get
source from `ftp.cli.com' or order the Emacs Tape or Source CD-ROM
from the FSF (see file `/pub/gnu/GNUinfo/ORDERS' for ordering
details).  For details ask `schelter@math.utexas.edu'