Atelier in the Blue Sky
   Text preprocessor, aftercommit, CD player, extension library for zlib, patches.
   http://www.blue.sky.or.jp/atelier/Welcome.en

DbTalk
   Interactive GUI-based tool for database querying, programming, administering, etc. Has 3 basic parts: SQL editor, query result viewer, database structure viewer. [Open Source, GPL]
   http://www.insula.cz/dbtalk/

Funaba.org: Ruby
   Applications: cal, dvipc, gtkcal, luna, nqt, rar, prof, stared, tkcal, tr-list, wc, Just another Ruby hacker; Libraries: calendar, date2, delay/force, once, smf. By Tadayoshi Funaba.
   http://www.funaba.org/en/ruby.html

PalmSync
   Ruby library for synchronizing PalmPilot with DBMSs.
   http://www.threeweb.ad.jp/~nyasu/palmsync/e.html

Radiuslib
   Full RADIUS protocol and utility library, protocol conforms to RFCs 2865, 2866; utilities are useful for many common system administration tasks. Description, documents, downloads, contact. [Open Source, GPL]
   http://www.nodewarrior.org/radiuslib/

Ruby
   Many useful, interesting applications, libraries: scripts, patches, extension modules, documents. English, Nihongo.
   http://ttsky.net/ruby/

Ruby == Perl.succ
   Ruby 1.4.2 FreeBSD port, tips, memoranda.
   http://www.bsdclub.org/~yasuf/ruby/index.en.html

Ruby.CHannel
   Ruby information, downloads, resources, RWIKI Plus, online interpreter (try Ruby online), interactive tutorial, Programming Ruby Interactive. The last two combine text examples with the online interpreter to run them. English, Deutsch.
   http://www.ruby.ch/en/rubymain.shtml

Ruby/Gtk Example: Tic-Tac-Toe
   Short introduction to Ruby/Gtk by example. Shows how to inherit Gtk+ elements and the use of a recursive MiniMax tree search.
   http://perplex.schmumpf.de/dev/tictactoe/ruby/

Ruby/Password
   Set of methods to create, verify, and manipulate passwords. Has interface to CrackLib library commonly used to check password strength. Intended use: system administrators who need programs to prompt for, generate, verify, and encrypt passwords.
   http://www.caliban.org/ruby/ruby-password.shtml

Zakki-Cho
   Software and several translated articles on programming and running Ruby on Windows. "Zakki-Cho" = "Notebook" in Japanese.
   http://homepage1.nifty.com/markey/index_e.html

freshmeat.net: Ruby
   Root Ruby page there, hosts near 300 open source projects.
   http://freshmeat.net/browse/835/