European VPN providers with strict no-log policies and servers in privacy-friendly jurisdictions. Replace US-based VPNs with Mullvad, ProtonVPN, and others.
Yes. ProtonVPN is free or has a free plan, according to the pricing each company publishes. Free plans usually carry limits; each product page links to the company's terms.
Which European VPN services are open source?
AirVPN, ProtonVPN and Mullvad publish their source code under an open-source licence. Each product page shows the licence and where the code is.