Airly have developed an air quality monitoring solution with a variety of applications, it is already in use by amateur runners to determine if there is high pollution levels in the areas they propose to run, and in healthcare.
FindAir have developed a simple but effective solution to assist asthma sufferers manage their condition
Skriware have developed an Edtech solution for school children to assist in developing STEAM (Science, Technology, Engineering, Arts & Mathematics) skills based upon their bespoke 3D printer, courseware and a library of models that can be used to build solutions.
StethoMe have developed a wireless electronic stethoscope with an AI powered backend analytics platform.
If you are interested in any of these topics i strongly recommend you look them up.
Jean-Baptiste Kempf, one of the lead developers of VLC media player (and President of VideoLan) wrote on the 7th June 2019 in his blog that they would not have identified and fixed so many bugs had it not been for the FOSSA bounty program.