What operating system does aconno’s products use?

aconno embedded projects are based on FreeRTOS. Currently, we use FreeRTOS.
FreeRTOS is a truly free professional grade RTOS for microcontrollers that supports 35 MCU architectures. RTOS stands for Real-Time Operating System. More info about FreeRTOS and RTOSes, in general, can be found here.