BitNami JRubyStack provides a fast, easy way to develop and deploy Ruby on Rails applications on a Java runtime using JRuby. It includes JRuby, Rails, Java, Tomcat, the GlassFish gem, MySQL, and Subversion. It supports Windows, Linux, and Mac OS X, so you can share the same Rails environment on multiple platforms.
YesPaste! is a pastebin application written with Ruby On Rails. It allows you to add a comment to the paste, and allows user comments. Comments can be formatted with BBCode syntax (with [code][/code] possibilities). CodeRay is used for code highlighting. It also permit paste editing.
Estimer is a Redmine plugin that allows you to estimate your software projects. It can calculate two types of software estimations: function point estimations (IFPUG) and use case estimations. Function point estimations are software estimations based on function points. A function point is a unit of measurement to express the amount of business functionality that the information system provides to users. Use case estimations are software estimations based on use cases and actors.