Yes. Vroff, Balsio, Stoat, Wire and Element 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 messaging apps are open source?
Stoat and Wire publish their source code under an open-source licence. Each product page shows the licence and where the code is.
Which European messaging apps can you host yourself?
Vroff, Stoat, Wire, Element and Threema can be run on your own servers, according to their own documentation.
