Erlang QuickCheck: A library for random testing of Erlang programs against specifications.
Erlang to mCRL translator: Software written in Erlang for translating Erlang source code to mCRL process algebra specification. The software makes industrial code available for research tools.
Inets mod_xsl: An XSL transformation module for the Inets erlang webserver
mod_erl: Module for Apache. It lets you use Erlang as an embedded language, just as PHP.
mod_xsl: An inets module to transform XML documents generated by mod_esi.
Sablotron Adapter: XSL tranformations in Erlang
XML Parser: An experimental XML parser in Erlang.
Yxa: A bunch of library like functions for receiving, processing and sending SIP messages, and a couple of small applications that can do various things.