The Shopunity Extension for Opencart is the first fully automated extension manager.
You will get the powers to install, update, delete, and purchase extensions.
What customers say about Shopunity Extension
This extension is a great idea. Installing and so went smoothly, but payment was a miss.
Paypal payment doesn't affect the balance, so the sent money doesn't appear in the account.
When support fixed this, not able to buy extension / pay invoice.
Support seemed to have hard times, took 4 days(!) to fix the balance.