1. Shopify – A complete eCommerce solution that enables you to create an online store, manage inventory, and accept payments.
2. Clover POS – An intuitive, cloud-based point of sale system designed for restaurants and retail stores that allows you to track sales data, manage menus and employees, and integrate with third party services.
3. Square – An easy to use, mobile-friendly point of sale system that allows you to accept payments quickly and securely with your smartphone or tablet.
4. Lightspeed Retail – A cloud-based POS system that offers a range of features including inventory management, customer tracking, loyalty programs, and employee scheduling.
5. Vend – An intuitive POS system focused on retail businesses that allows you to track sales, manage customers and inventory, and generate reports.
6. Toast – A cloud-based restaurant management solution that includes features such as menu engineering, employee scheduling, guest profiling, and loyalty programs.
7. Revel Systems – A comprehensive POS system that includes support for Apple and Android devices, secure payment processing, advanced reporting, and inventory management.
8. IC Intracom – An all-in-one solution designed to simplify the tasks associated with running a retail business such as product cataloging, customer tracking, and employee scheduling.
9. NCR Silver – A powerful yet easy to use POS system designed for small businesses that offers a range of features including inventory management, payroll processing, and employee scheduling.
10. PayAnywhere – A comprehensive mobile payment solution that allows you to accept credit card payments anywhere with your smartphone or tablet.
11. Mindbody – A customizable POS system designed for spas and salons that provides features such as inventory management, appointment scheduling, customer tracking, and payment processing.
12. Micros Retail – A cloud-based POS system tailored to the needs of large retail chains. It offers robust reporting capabilities and seamless integration with a variety of third-party services.
13. Oracle Retail – A comprehensive POS system designed for large retail operations that provides an array of features including real-time inventory management, customer segmentation, and data analytics.
14. BindoPOS – An affordable iPad based POS system that offers a range of features such as employee management, inventory tracking, and customer loyalty programs.
15. Epos Now – A cloud-based POS system designed to simplify the management of retail businesses. It offers a range of features such as real-time analytics, payment processing, and employee scheduling. 
16. AccuPOS – A cloud-based POS system designed for retail businesses that offers features such as inventory management, customer tracking, and integrated payment processing.
17. Shopkeep – An intuitive iPad based POS system that provides a range of features such as real-time analytics, employee scheduling, and data integration with QuickBooks.
18. ERPLY – A comprehensive retail management system designed to streamline the tasks associated with running a retail business such as inventory tracking, customer segmentation, and employee scheduling.

Finally, the success of any vital POS system depends on its ability to scale with your business, meet your specific needs, and offer robust customer service. By carefully researching these options and evaluating each one against your unique requirements, you’ll be able to select the solution that best fits your needs now – and for many years to come.