Ruby-Doc.org: Documenting the Ruby LanguageCurrent Ruby Releases These are the complete API documents for base classes, modules, and included libraries in the current stables releases of Ruby. Complete API docs for Ruby 3.2.2 Complete API docs for Ruby 3.1.4 Complete API docs for Ruby 3.0.6 Complete API docs for Ruby 2.7.8 Complete API docs for Ruby 3.3.0.preview2 Older Ruby Releases Complete 3.2.1 Complete 3.2.0 Complete 3.1.2 3.1.1 Core
http://libxml.rubyforge.org/rdoc/
http://railsapi.masuidrive.jp/
