Drops app - Originally from Estonia, now a Kahoot! company which is from Norway. In few minutes a day for unpaid version it builds your vocabulary and you can also search by the topic. They offer wide range of languages. They also support Ukraine.

Link: https://languagedrops.com/

Babbel - Most widely known subscription-based app where you learn with language professionals. Origin in Germany.

Link: https://www.babbel.com/

Preply - Tutoring platform focused on languages originating in Ukraine. It is like a marketplace where tutors offer their language services and you can book tutor for language you want to learn.

Link: https://preply.com/

Lingoda - German online language school

Link: https://www.lingoda.com/

https://www.memrise.com/ is British

Feel free to share more if you have them and/or your experience with the ones above

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[–] AccountMaker@slrpnk.net 6 points 4 days ago (1 children)

Hands down the best free Greek course I ever came across, can't recommend it enough for anyone interested in Greek.

[–] gramie@lemmy.ca 5 points 4 days ago* (last edited 4 days ago)

I've been learning Spanish, and it's hands down the best language course of any kind I've ever used, and I already speak five languages.

Completely free (funded by donations, I've been donating $5 a month for several years now) and you can use it on YouTube, SoundCloud, or the excellent smartphone app.