Hgfs is a read-only filesystem interface to Mercurial repositories. The interface gives access to the commit message, manifest, and files of each revision, and to .tgz's of each revision (the .tgz's are generated as they are read). The filesystem is a front-end for the Mercurial library that comes with it. All code is written in Limbo, for Inferno.
Httpd is a modern httpd for Inferno. It supports HTTP/1.0 and HTTP/1.1, virtual hosting, CGI and SCGI, logging, index file serving for directories, and directory listings, has configurable MIME types, understands range and conditional requests, does HTTP Basic authentication, and supports redirections based on regular expressions.