Opa is an open source, simple and unified platform for writing web applications. All aspects are directly written in Opa: Frontend code, backend code, database queries and configuration. And everything is strongly statically typed.
Opa is available on MacOSX,Windows,Linux and FreeBSD
Designed specifically for web apps, Opa is a great tool for easily building real-time web applications and services as well as games! And thanks to it’s event-driven, non-blocking approach, Opa is perfect for writing any social application.
Learn more: http://www.opalang.org/