Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Ramaze - Ramaze is a very simple and straight-forward web-framework.
Rust - A safe, concurrent, practical language
Cuba - Cuba is a Ruby microframework for web development.
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible
Scorched - Scorched is a generic, unopinionated, DRY, light-weight web framework for Ruby.