Thank you very much for your interest.
Let's see each of the add-ons:
With the Multi-Inventory add-on, you can take inventory control much easier, as you can create as many inventories for the product as your business needs. To see more features and how this premium add-on works you can by following this link.
There is a Product Levels, the essential add-on for any contractor or manufacturer. So, if a Bill Of Materials or product structure (BOM) is required to keep track of your production inventory, you can look at this add-on. Here you can find the info on how it works.
Regarding the Purchase Orders PRO, this add-on gives the user advanced control over purchasing, it expands and improves the advantages that Purchase Orders has in ATUM free. Here you can see all features that it has.
Export PRO gives allows you to generate manual or automated exports of almost any data in your WooCommerce, which has the most advanced tool for exporting and importing from WC using XML, CSV, and JSON files. See the documentation here.
With Action Logs, you can track any changes in your shop. You can find more info here.
Meanwhile, if you need the ATUM Free version, you can easily find it here.