This page is the starting point for developers looking to contribute to and/or modify Daffodil.
In the side bar on the left you should see a variety of child pages for various developer topics.
A few smaller topics are covered directly here.
Microsoft Windows Users
Daffodil depends on Unicode support. Some MS-Windows versions do not come with Unicode support by default. Daffodil has tests that make use of Japanese Kanji characters, so requires the Japanese Language Pack be installed.