MageAnts also offer magento 2 migration services too you can visit here https://www.mageants.com/magento-1-to-magento-2-migration-services.html and request for free quote now

A customer may not check up on your online store for products, then, how to keep them updated? Presenting Magento 2 Out of Stock Notification Extension which will keep your customers timely informed about the current status of products as well what's new and upcoming on your store.

Features

Let Clients to subscribe to Alarms for stock, price change, Revenue of and Brand New Goods
Get the Record of subscription list in Addition to low-quantity Goods
Let Clients to subscribe to Particular Merchandise or group of Goods
Display Telling and stock alert at a popup or onto a page
May send Alerts to Clients in Addition to guest Traffic
Notifies admin Mechanically about Reduced stock and Brand New subscriptions
Get stock notification report to keep a track of your inventory
Establish automatic or manual Telling Through email

Magento 2 Out of Stock Notification - https://www.mageants.com/out-of-stock-notification-for-magento-2.html
Frontend Demo - http://outofstocknotification.demo4.mageants.net/clamber-watch.html?return_url=https://www.mageants.com/out-of-stock-notification-for-magento-2.html

MageAnts provide magento 2 gift card extension https://www.mageants.com/gift-card-extension-for-magento-2.html

MageAnts also offer magento 2 pre order extension https://www.mageants.com/pre-order-extension-for-magento-2.html

Here you can see best 5 magento 2 extensions which can help to boost your sales

Magento 2 Instagram Integration - Fetch and display images in an effective way from your Instagram feed to your store’s website using the Magento 2 Instagram Integration extension. Configure details and links for the image and showcase a nice gallery to your customers.
Buy Now https://www.mageants.com/instagram-integration-for-magento-2.html

Magento 2 Multiple Wishlists - Let customers save their favourite products for later using Magento 2 Multiple Wish lists Extension that will allow them to create even multiple guest wish lists which they edit, move, update, delete & share with others as well as and when they want.
Buy Now https://www.mageants.com/multiple-wishlists-extension-for-magento-2.html

Magento 2 Pre Order - Give your customers a continuous shopping experience by allowing them to get the product they are willing to buy even if it is out of stock or not released yet using Magento 2 pre-order extension.
Buy Now https://www.mageants.com/pre-order-extension-for-magento-2.html

Magento 2 Product Reviews - Enable an effective review system using Magento 2 Product Reviews extension. Provide advanced features to customers & help them understand products through ratings & have a good shopping experience.
Buy Now https://www.mageants.com/advanced-product-reviews-for-magento-2.html

Magento 2 Delivery Date - Provide your users over the store with a satisfying experience using the Magento 2 Delivery Date extension. Configure your store by adding the delivery date on the checkout page and allowing users to select their convenient time slots for delivery.
Buy Now https://www.mageants.com/delivery-date-for-magento-2.html

Mageants also provide magento 2 follow up email extension view here https://www.mageants.com/follow-up-email-for-magento-2.html

Visit here https://www.mageants.com/store-locator-extension-for-magento-2.html for magento 2 store locator

I like to share one more extensions which can boost your sales see this https://www.mageants.com/pre-order-extension-for-magento-2.html

I think you have missed 1 more magento 2 social login extension provider see here https://www.mageants.com/social-login-extension-for-magento-2.html