We may distinguish 5 types:
1. Retail-focused digital solutions. These are platforms for digital management that you adjust for order management. Such platforms provide effective accounting functionality, CRM, reporting, etc. But they lack a focus on your needs.
2. Standalone OMS. These were described in this article. Such platforms are built straight for order management and can be integrated with other back-office software.
3. Manual order management. This is when you use spreadsheets or some conventional tools for management and manage everything manually.
4. EPR software. Enterprise resource planning covers broader needs. Apart from OM, it includes HR management, CRM, and more.
5. The standard tools (provided on the ecommerce platform). If you use Shopify, Magento, WooCommerce, you make use of what these platforms offer for managing orders. As a rule, the functionality is limited, and you need to customize the system to make it more goal-focused.