PayPlus Software has been in business for over 25 years. PayPlus Software is the leading software provider for Professional Employer Organizations (PEOs). More PEOs use PayPlus than any other PEO software. A LOT more. PayPlus is designed specifically to operate PEOs and/or temporary staffing companies. It is "PEO software by PEOs"—the only PEO software developed by PEOs for PEOs. PayPlus is a powerful, comprehensive PEO software system---the industry standard. It is easy to use and affordable, making it astonishingly easy for customers to add our secure, proven web functionality to their core PayPlus systems.