| Strscan | Fast string lexical scanner library. |
| Amrita | An html/xhtml template library for Ruby. It makes html documents from a template and model data. |
| Ruby mysql | mysql interfacing from ruby. handy with your databases. |
| Ruby postgres | Extension library to access a PostgreSQL database from Ruby. |
| Ruby/DBI | A database independent interface for accessing databases - similar to Perl's DBI. With the following drivers: DBD/Pg, DBD/Mysql, DBD/proxy, DBD/sqlrelay, DBD/ODBC. Other drivers are possible. |
| mod_ruby | Direct apache web server interface and accelerator. default extension filename: .rbx . You can have mod_ruby apache directive for your sites, and have auto-reload enabled. |
| eruby | Ruby embeded in html, a popular extension to mod_ruby. handles .rhtml files. |
| RAA - druby | Distributed ruby. DRb can send message to other ruby script that like Java's RMI. |
| RAA - ruby-rss | parsing lib for creating, downloading, and caching RSS |
| XML Parser | An interface for James Clark's expat xml library. |
| RAA - uconv | A code conversion library for UCS-4, UTF-16, UTF-8, EUC-JP and CP932. |
| HTML/Template | templating system |
| HTML/FillinForm | html forms |
| CGI_Application | cgiapp from moonwolf |
| tk.rb | to make Tk/X11 based ruby apps |
| ruby-pcap | interface to LBL Packet Capture library. includes classes to access packet header fields. |