Camping at the Mailbox, a small, fast, focused IMAP client.
Camping Calendar, a basic CalDAV server in Ruby
ruby-dazuko lets you access the dazuko module from ruby.
packstruct makes generating specific binary structures much easier.
ruby-inotify is an extension to access the linux inotify system calls.
ruby-xattr is an extension to access the XFS-compatible *_attr system calls.
webrick-fcgi is a WEBrick-compatible API for the FCGI library.
xhtmldiff is a tool for creating valid XHTML documents with redlining from valid XHMTL input documents.
mkpolicy is an IPsec policy generator, supporting cross-product combinations of hosts, and name lookup, both IPv4 and IPv6. It properly supports ICMPv6 policy generation.
ambindextrous is an enhanced directory-index script for your webserver.