RubyMotion is a commercial toolchain that allows developers to build iOS, Android, and OS X apps using the Ruby programming language. It compiles Ruby code into native applications that can access platform APIs. This allows developers to write apps once in Ruby and share code across platforms while isolating platform-specific code. RubyMotion apps can be packaged for distribution in app stores. The presentation demonstrated RubyMotion and discussed supported libraries, platforms, IDE integration, and resources for learning more.