WinSaaS is a free multi-tenant software as a service (SaaS) server for Windows and a rapid application development (RAD) tool for SaaS providers or anyone that wants to build web based applications within a low budget and a small time period.

It allows you to build, run, rent, place advertisement and support software services in the internet, intranet or extranet to your customers, agents, franchisees, resellers, employees, basically to anyone.