ETL Tools

Open Source ETL (Extraction, Transform, Load) Written in Java
http://www.manageability.org/blog/stuff/open-source-etl

KETL is an open source ETL tool by Kinetic Networks that is gaining mindshare of late. It is currently downloadable as part of Bizgres BI project, but can be setup for other databases with a little tweaking.

KETL is different from Kettle, another open source ETL tool (you can read more about the story behind similar names here at Nicholas Goodman's blog). While Kettle (API)  is GUI oriented, KETL is scripted.
http://business-intelligence.phi-integration.com/

https://docs.google.com/browse#folders/folder.0.0B9ZAe6ftekYJNTc0OWM2NzctNzM3MS00YmNjLTkyMTctZjg0ZWUxZWI2YWQw
TogetherDownloads - Workflow, Data Transformer, Relational Modler.. etc...  http://www.together.at/download

http://software.xineo.net/xil.jspx  -- APIs

http://scriptella.javaforge.com/

http://www.smooks.org/mediawiki/index.php?title=Main_Page