Interesting. I guess Blue Card is not for freelancers, right? i.e. to just directly apply on my own.
Another scenario - I'm a contractor/freelancer working for some non-EU company, but just want to live some period in EU, without changing a job. (Reasons could be e.g. a better school for children, etc..)
It's not for freelancers, no. You can go to Germany and stay up there for up to six months while looking for work, but to get a Blue Card, you have to have a contract with an annual salary attached to it. Your Blue Card is good for the length of the contract plus three months. However, as mentioned, if you stay long enough, you can apply for permanent German residency.
Keep in mind that the German government has been tweaking the Blue Card law, so you probably want to reverify what I've said if you go that route. That being said, I just received a PM on Reddit from someone who moved to Germany after seeing a post I made about the Blue Card and they just got a job offer. They're going to sign and apply for their Blue Card with that contract.
Is the Blue card valid for all of Europe or only Germany? If a german company gives me a blue card can i apply for a job in france or will the french company have to apply for the blue card too? What i am trying to understand is if it is like the H1B visa.
Another scenario - I'm a contractor/freelancer working for some non-EU company, but just want to live some period in EU, without changing a job. (Reasons could be e.g. a better school for children, etc..)