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.
- http://www.stacken.kth.se/project/yxa/

Erlang QuickCheck
- A library for random testing of Erlang programs against specifications.
- http://www.cs.chalmers.se/~rjmh/ErlangQC/

XML Parser
- An experimental XML parser in Erlang.
- http://www.sics.se/~joe/ericsson/xml/xml.html

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.
- http://sourceforge.net/projects/etomcrl/

mod_erl
- Module for Apache. It lets you use Erlang as an embedded language, just as PHP.
- http://www.rfc1149.net/devel/mod%5ferl.html

Inets mod_xsl
- An XSL transformation module for the Inets erlang webserver
- http://sourceforge.net/projects/modxsl/

Sablotron Adapter
- XSL tranformations in Erlang
- http://www.lfcia.org/projects/sablotron_adapter/

mod_xsl
- An inets module to transform XML documents generated by mod_esi.
- http://www.lfcia.org/projects/mod_xsl/