Maps:
www.GPS-routes.co.uk
www.Freizeitkarte-osm.de - Maps for Norway, Denmark and Netherlands
https://www.plotaroute.com

Charts:
www.chart-sales.co.uk - Cheap and reduced price charts, cancelled charts etc
www.fishing-app.gpsnauticalcharts.com 

Tides:
www.tides4fishing.co.uk

Weather:
www.xcweather.co.uk