SPBAS is a complete customer management software solution offered by Post Affiliate Pro that allows you to conduct, handle and manage all the steps and processes to deliver the successful product in terms of software or application to your customer ….
We don't know any good SPBAS open-source alternatives yet.
You are more than welcome to suggest any alternatives that you know of, or ask the community for suggestions.
Alternatively, we recommend checking out LibHunt for open-source libraries and alternatives to SPBAS.