A rack middleware for enforcing rewrite rules. In many cases you can get away with rack-rewrite instead of writing Apache mod_rewrite rules.

Desviar provides URL redirection; some possible applications include: - Web signup process - Continuous-deploy servers - Online ticket sales

Redirect is a simple Ruby redirect DSL build on Rack. It's like a simple Ruby mod_rewrite, so you can write and test your redirects in Ruby.

Reflection is a Rails plugin and standalone Rack middleware library. Give up quirky config syntax and use plain old Ruby for your rewrite and redirection rules.