I want to create an ADF file for BDC....i want to know if there are any free open source tools for creating ADF files.
You have it free and good tool inside a MOSS SDK 2007blogs.msdn.com/.../...-sharepoint-server-2007.aspxFree version from Microsoft
Application Definition Designer in MOSS SDK 2007 is what I personally recommend. It gives you much more flexibility and you actually come to know conceptually the impact of each and every change.