Sometimes I receive some notification on where source code for both db2hbm and hbm2net are located. The best way is to check-out the source of the NHContrib project: https://nhcontrib.svn.sourceforge.net/svnroot/nhcontrib

hbm2net is still in alfa, but I frequently use it in my projects as a class generator. It really lack some documentation: it is really a powerful artifact generator, and by writing proper T4 templates any artifact can be generated. Db2hbm is working ok for MSSQL, but there is not yet an implementation for oracle and other DB, even if Ricardo Peres provided me some interesting code to work on.

Hope this help who’s looking for these tools source code.