Is Odoo free to use?
Odoo is an open source program and you never pay for it. The opensource version is not crippled. You have full access to the latest versions of the modules through odoo.com, github and other code repositories.
How do I create a barcode inventory system?
What is SKU QuickBooks?
Stock keeping unit (SKU) is used to track variation of your inventory items. It's an alphanumeric code that has key characteristics of the product's color, size, type, etc. In QuickBooks Online, you can create SKU when you add inventory items.