#1
Dependent/Related Product Options (Opencart 3.x)
Module is designed to set related-to-option values for goods (eg. colour and size). Thus it gives a way to account goods on stock depending on option combinations. Option combinations also can have different prices.
#2
PrivateContent - User Data add-on
User Data add-on is is everything about fields and forms: allows you to create unlimited fields of any type (except uploads) to record more informations from your users. Once created, they will be automatically integrated in PrivateContent engine and ready to be used in registration or data-update forms.