The new EU citizen science platform has just gone online. This is full of projects you can take part in (from home and in the field) and in itself well worth a visit.
Two projects stand out in lockdown coronavirus times. Both use combined human brain and computing power to help fight the virus. The first is called FoldIt and is an online game with real-world outcomes. The second, Folding@Home, allows you to make your home computer processing power available in the fight against the virus.
The EU citizen science platform also has a very useful page with lots of citizen science resources related to the pandemic.