Just normal bank transfer. As long as you have the target bank account number, which is standardized across Europe now, you can pay anyone. Takes a few days though. There is a European rule that a cross-border transfer may not cost more than a national one, which means that in most countries, only business accounts pay (low) fees.
In the Netherlands, within the same bank it can be within an hour or so, but to other banks up to two days. Internationally from/to NL can still take a week in my experience.
