Development of ETL is centered around its subversion repository and mailing list.
The ETL subversion repository is located at https://svn.i-want-a-pony.com/repos/etl/.
Discussions related to ETL development and use are conducted on the dev@etl.i-want-a-pony.com mailing list.
To subscribe, just send a mail to dev+subscribe@etl.i-want-a-pony.com.