If you are a European resident then you qualify for the Interrail Pass, which allows you to travel in 30 European countries for up to one month. You can also buy a pass for just one country.
My InterRail are running a flash sale and they are offering 5% off all Interrail passes for a limited time.
Offer: 5% off all orders
Expiry: 23.55 18 August, 2015.
If you are not a European resident then look for Eurail deals at Eurailtravels.com.