I Want Open-Source PDF Editor On My VPS With Good UI & Functions

I'm looking for a good Open-Source PDF Editor on My Server with Commercial License allowed to sell. Please drop the URL of any Open-Source project you have or you can get it from GitHub or anywhere but it should be working & with the Good UI.

Also, I just want to add a Payment Gateway Page & User roles based on subscriptions they purchase.

Project Eg. https://smallpdf.com/edit-pdf