I'm building a new project using Seam 3. I don't understand what the difference is between Weld archetype and Seam Forge. Both of them help us to build a simple project template to start with.
Seam Forge is a tool similar to seam-gen from Seam 2. Seam Forge is a console where you can setup and generate your project, you can choose a version of libraries, JPA implementation etc you can create classes, add fields to them, create CRUD and many more
weld archetype is a 'simple application' (configuration) with pom, configuration files and example classes ready to develop your application
I think Seam Forge is stronger tool and have many features helping rapidly develop your application.