Is there a good source to compare academic salaries at European universities? For example, what are the salaries of full professors in different countries?
I would particularly welcome a possible source, a link pointing to a page where this information is available.
For Germany the best website to see professor salaries is the following: https://www.academics.de/wissenschaft/w-besoldung-2014-eine-uebersicht-der-grundgehaelter_56973.html
It gives the W1, W2, and W3 Professor ranges. Just keep in mind that it is not strictly comparable to an assist, assoc, full ranking as W2 is considered also a full professor. Also, there is not tenure track system in Germany, although a couple universities are starting to experiment with it so you can have a permanent or temporary contract that may become permanent in the future or may not.