Here's a list of Summer, Winter and all year open resorts in Europe. I've thrown together with links to their English sites for quick reference.
Please feel free to add some more links to your favorite resorts! Enjoy
STELVIO GLACIER (Italy/Switzerland) - Summer Resort
We've had quite a bit of snow the last 2 weeks. Stelvio glacier is really awesome to ride at the moment with all the new snow. The summer glacier resort will close on November 1 until next summer.
SULDEN (Italy) - Winter Resort
Sulden will open for the Winter season within the next few days on October 22 until May.
PITZTAL GLACIER (Austria) - Winter Resort
Open from September to May on Tirol's highest glacier!
KAUNERTAL GLACIER (Austria) - Winter Resort
Open from October until June on Tyrol's youngest glacier!
Zermatt (Switzerland) - All year Resort
Open 365 days a year. Enjoy skiing and snowboarding on this popular glacier in Switzerland.
Schnalstal Glacier (Italy) - Winter Resort
Open from September until May in South Tirol, Italy
Hintertux (Austria) - All year Resort
Open 365 days a year for your skiing and snowboarding needs!