Here are some web links I have collected and frequently use. Additional notice : for flight preparation use the official resources.
Web Link Flugwetter
Official DFS weather website, Members only
Web Link Knmi - Aviation Weather
Official Dutch weather website, Members only
Web Link Knmi - Low Level Forecasts-FIR 3 (Land)
Web Link Knmi - Weerbulletin kleine luchtvaart
Web Link Knmi - METAR
Web Link Knmi - TAF
Web Link Knmi - Actueel
Web Link NOAA - Aviation Weather
Web Link Orbifly Met'Map