Is there any extension which allows customers select specific products they would like to reorder?

[Robin84]

I want an extension which allows my customers to select specific purchased products in Magento 2

Can anybody help me? thanks in advance!

[Aheadworks]

Perhaps, you mean something like the Subscriptions and Recurring Payments extension allowing customers to purchase subscription products regularly.

Here are the modules for Magento 1 and Magento 2:

Subscription & Recurring Payments for Magento 2 - https://goo.gl/Bu4t4g

Subscriptions and Recurring Payments for Magento 1 - https://goo.gl/N3h9Tq

[BSS Commerce]

You can consider using Magento 2 Reorder Product. The extension helps customers to reorder previously purchased products quickly in their Accounts. 

Let's check demo of Magento 2 Reorder Product for more useful features.