Which famous language learning platform adopted the tagline "The free, fun, and effective way to learn a language"?

The language industry has been shaped by innovative companies that revolutionized how we communicate, learn, and process language. Behind many successful language products and services are memorable taglines that captured their essence and mission. This poll tests your knowledge of famous taglines from language learning platforms, translation services, and linguistic technology companies that have made their mark in the industry.

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Duolingo
Rosetta Stone
Babbel
Memrise