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Duolingo offers free instruction in over 30 languages (including those in beta) for speakers of English, and its site is localized for nearly two dozen languages (https://www.duolingo.com/):
Mobile apps are available from:
Duolingo's Finnish course is still pre-beta. It's slated for completion in April 2020 (Duolingo Incubator, 2019.08.06).
To review French, an additional language that I began to study in high school several decades ago, I adopted Duolingo 2016.03.24.
To practice Japanese, another language that I've studied both formally and informally for decades, I added Japanese for English speakers to my Duolingo repertoire (n.d.).
for Japanese teachers of English who want to learn and practice classroom English, to improve their pronunciation, and enhance their confidence.