WEATHER:

Metar, Taf, High Altitude Winds, Notam:

http://avwx.info

Vertical cross section of atmosphere:

http://www.ogimet.com/gramet_aero.phtml.en

Detailed three day weather:

http://www.meteo.pl/index_en.php

SWC Nordic SFC - FL450:

https://www.aro.lfv.se/Links/Link/ViewLink?TorLinkId=229&type=MET

Radar, Denmark with vicinity:

http://www.dmi.dk/vejr/maalinger/radar-nedboer/

MAPS AND CARDS:

All of Europe AIP (free registration required):

https://www.ead.eurocontrol.int/cms-eadbasic/opencms/en/login/ead-basic/

Lido Route Manual "for simulator" (Lufthansa), EUR 80 per year.

https://www.navigraph.com

FLIGHTPLANNING:

Simple flightplanning:

https://skyvector.com

IFR and VFR routing (free registration required):

https://router.euroga.org

IFR router to download:

http://www.flightplanpro.eu/Download.html