By official data, European people spoke more than 250 languages, but the states recognize about 1/3 of them. Even English is wide spread and a majority of Europeans has a good knowledge of it, again for living, working and studying in European countries, it is good to know the basics of some language to adapt in a local society.
Even there is a lot of apps for languages learning, we focus here on the official platforms which have tests with the certificates.
https://learnenglish.britishcouncil.org
https://www.goethe.de/de/index.html
https://www.institutfrancais.com/en
https://manila.cervantes.es/en/default.shtm