This paper presents a workflow for developing small pumps and fans, starting with target fluid dynamic and aerodynamic performance requirements and concluding with experimental validation. The approach emphasizes the use of open-source tools and low-cost experimental equipment, enabling budget-friendly development without compromising essential state-of-the-art standards. The workflow is designed to support small enterprises, universities, and technical schools. Classical, well-established fluid dynamic and aerodynamic design methods, extensively documented in textbooks, are encoded in an open-source high-level programming language to facilitate rapid variation of design parameters. The resulting geometric parameters are imported into an open-source CAD program to generate a 3D model. While performance simulation using an open-source Navier–Stokes solver is an option, it requires advanced expertise and computational resources and is therefore omitted in this study. Instead, validation is achieved through low-cost prototypes produced with desktop 3D printers. Performance testing is conducted using a compact rig compliant with relevant standards. To reduce costs, conventional high-priced measuring instruments are replaced with a data acquisition system built from an open-source programmable circuit board, coupled with low-cost sensors and a standard PC. A concluding case study demonstrates the effectiveness of this budget-friendly workflow for developing a small pump and an axial fan.