Here is a list of the most important public registers and databases. They contain information about admission to professional status and membership in chambers or offer data about the economic or legal situation of the registered people or companies. A click on the relevant entry will take you to the website.
This information can be interesting for you in the course of research examining whether a service provider can be helpful to you. Moreover, you can use it to explore the current supply situation before you start up a business operation in the services sector.