NATS AIS – The UK AIP/AIC/Notams – access needs free registration (never understood why)
Skydemon Light – A free VFR flight planner for UK airspace sponsored and approved by NATS
Olivia – French flight planning site with weather, flight plan submission, NOTAMS
French SIA – The French AIP (no need to log in and NOTAMS are easier to use).
French VAC – This is where to get French airfield information and plates
French Charts 2020 – Due to Covid-19 restricting printing, this year French charts are available on-line for free
Airspace & Safety Initiative – Good practice for all pilots
Mach 7 – another one!