Rails or RORworks with a wide range of web servers and databases.

For the web server, we recommend Apache, lighttpd, nginx proxying to Mongrel (or using FastCGI) and Phusion Passengeror

For database, you can use MySQL, PostgreSQL, SQLite, Oracle, SQL Server, DB2, or any of the other many systems we support. Just about any operating system will do, but we recommend a 'nix-based one for deployment.

Deployment tools : Capistrano  (push updated code to your server with a single command and even revert to an older version of your code if something goes wrong)