Open-sun drying is a primitive food preservation technique. Also, solar dryers of various designs, capacities, and sizes have been developed by the agricultural processing industry. There are some limitations for the solar dryers, like intermittent solar radiation throughout the day, unavailability at night, and seasonal variation in intensity; hence, continuous drying is not possible with them. Continuous drying of agricultural produce can be achieved through a combination of solar and auxiliary heating sources in a mixed-mode system. Biomass is the most widely used auxiliary heating source due to its availability and low cost in rural areas of developing countries. Until now, many researchers have designed, constructed, and examined the Solar Biomass Hybrid Dryers (SBHD). The solar biomass hybrid dryer is one of the most noticeable dryers used to dry agro products. Different designs for drying different products have been developed and tested experimentally by the researchers, and the results have been validated with software like CFD (Computational Fluid Dynamics) and Ansys. Mathematical models like the page model and modified page model have been developed for predicting the drying results. The purpose of this paper is to review the design features, construction, and experimentation carried out over SBHD by different researchers, and summarize their findings to provide a basis for new developers.