Greetings Eduardo Galvan,
Our apologies, it appears you never received a response to your questions posted here. In case you are still interested in knowing this information, please find the answers below:
1. This product is not entirely open source, as it is being developed and licensed as an extension of the ThingWorx platform. If you are working with the Extensions (imported into the full ThingWorx Platform) or the Dev Kit installer, you will have the ability to customize certain aspects of the ThingWorx Manufacturing Apps within ThingWorx Composer. For more information on these methods, see the ThingWorx Manufacturing and Service Apps Customization Guide 8.1.0.
2. / 3. For information about the download options, how to register with the ThingWorx Manufacturing Apps portal, and more, see this Community post:
Getting Started with the ThingWorx Manufacturing Apps Community
Let us know if you are still unresolved on any of your questions, or feel free to create a new post if a new question arises.
Best regards,
Steven M