The Vision 2020 Shared SERVices project offers an "ESS SOA platform" where services that can be centrally hosted are offered for use by any ESS member.
To host a service, some requirements need to be met as the European Commission supports a finite number of technologies. You will find here the reference document about the supported platforms.
Services that are already hosted and exposed can be find in teh provided list.
Please note that some technologies are readily available and some can be provisioned.