Yes. MetriXs, Uptimia, UptimeRobot, Hyperping, Phare Uptime, Offen, Analyzati, Counter and 10 more (see the table) are free or have 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 web analytics tools are open source?
Offen, Counter, Swetrix and Plausible publish their source code under an open-source licence. Each product page shows the licence and where the code is.
Which European web analytics tools can you host yourself?
Offen, Swetrix, Pirsch and Plausible can be run on your own servers, according to their own documentation.
