Shenzhen Huaqiu Electronics Co., Ltd, better known as NextPCB, is a PCB manufacturer with multiple factories in China, and that has been around for over 15 years. During this time, the company dealt with thousands of engineering problems of PCB leading to higher prices and delayed schedules.
So to help its customers, the company has developed NextDFM software to detect common PCB design problems, and ultimately help engineers to build low-cost and high-efficiency PCB projects. DFM stands for "Design For Manufacturability", glad you asked.
NextPCB is a free download that's available for Windows only for now, but the company