I am also a lisp newbie? which tries to maintain asdf-addons library.
Common Lisp Implementations I use are Clisp under win32 and linux and SBCL under linux. I'm also keeping a watch on win32 port of SBCL, and win32 version of ECL. ABCL is nice too, as it runs everywhere where Java runs.
Killer lisp implementation would be one that would run on both win32 and Linux, support threads, be free for use in both open and closed source projects. There is no close match currently, but once SBCL port for win32 is completed, it would be verry close.
Also, I'm currently in search for a decent free profiler library that actualy works.
On win32 platform I run NTEmacs which is a nice current Emacs binary for windows.
As of lisp library things I would recommend ASDF, CFFI, araneida, kpax, ...
For database development I recently made clsql to work under clisp in win32 using cffi-uffi-compat and a little patch. Clsql seems interesting for further investigation.
This page is linked from: asdf-addons Corman Lisp Current recommended libraries ECL UFFI win32
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