Erlyweb is an open-source web application framework written in Erlang and released under the GPL. ErlyWeb was created by Yariv Sadan. It builds upon Yariv's earlier modules that he created for Erlang: Smerl (Simple Metaprogramming for Erlang), ErlyDB (a database abstraction layer for Erlang), and ErlTL (a templating language that compiles to Erlang).
The code is available at Google Code.
Currently, several sites have been built using ErlyWeb: