We want to start an online ebooks downloads membership website, where user can select membership type and able to to download ebooks and other digital goods. let me know any good existed membership script full setup or SAAS based.
Use Easy Digital Downloads and their Add-Ons.
I’m not familiar with anything else.
Any ecommerce system will handle online downloads e.g. Opencart (my favourite), Magento, Prestashop etc
Your best bet is to demo each and see which one does what you need now, and does what you might need in xx months