If you’re interested in higher education in France, then bookmark campusfrance.org. It’s an extensive search engine for grants in France. You can search by type of grant, subject area, level of education and even nationality.
For funding in Germany, the DAAD should be your first port of call. They too have a handy search engine where you can research the different types of funding offered by not only the DAAD, but also other financial support organisations.
The Spanish website Universaria is worth checking out for information on grants, scholarships and funding available in Spain as well as for European nationals. It’s also packed with info about the education system, so do have a look at their various sections.