These are top and recommended sales representatives extensions in Magento 2.

1, Magento 2 Sales Rep Extension by Landofcoder

Help you manage and improve the performance of your sales representatives by assigning them to specific customers, orders and quote requests. Also, Magento 2 Sales Rep Extension is an effective tool to enhance personal shopping experience by letting customers choose preferred dealers they want to work with.

Link: https://landofcoder.com/magento-2-sales-rep-extension.html/

2, Sales Reps and Dealers for Magento 2 by Amasty

Provide high-quality service and individual approach to each customer by including dealers in your business model. With this convenient tool, you can effectively manage the work of your sales reps and monitor their productivity.

Link: https://amasty.com/sales-reps-and-dealers-for-magento-2.html

3, Sales Representative extension for Magento 2 by Brainacts

Easily manageable module was created to help you forget about any manual work. Magento admin or store owner can assign customers, orders and products to the specific sale representatives by using this extension. Commissions’ rate can be managed for each SR separately. Different rates can be setup for products, orders and customers.

Link: https://www.brainacts.com/sales-representative.html