Lisp dialect by Paul Graham; readings in: design philosophy, lessons, why it isn't especially object-oriented, FAQ. Open source, Perl Artistic License.

Encyclopedia article, with links to many related topics.

Page at Massachusetts Institute of Technology, Computer Science and Artificial Intelligence Laboratory (CSAIL), in the PDOS group, of main Arc coauthor. Contact information, list of publications, talks.

Newbie-friendly community, because all Arc users are new to some extent. User forums with many threads. Open source, Perl Artistic License.

Encyclopedia article, with links to many related topics.

Lisp-like scripting language for .NET; uses Lisp dialect similar to Arc but tightly integrated with .NET Framework which has a rich set of libraries. Open source GPL.

Weblog on development, news, views, software experiments, by L Sharp author.

Project page, with downloads, repositories, forum.

User community, forums with several threads.