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Language Reactor
"Chrome browser extension that helps you translate Youtube or Netflix subtitles into powerful language lessons to help you get fluent." Download
here. Pro version costs money.

Bing AI Just KILLED Traditional Language Learning
"Bing AI just turned language learning on its head … changing the way we learn languages …" Microsoft's AI chatbot offers language learners powerful new tools.

Rosetta Stone
Famous language learning software uses images, text, sound to teach words, grammar by spaced repetition, without translation. 30+ languages.

Language Learning Tips
The administrator of Omniglot (who knows 20 languages) provides his personal suggestions for learning languages, favorite learning sites, etc. More tips here.

Tandem
Engaging in conversations with native speakers of the language you're learning is critical. This site introduces language learning partners. Just ten languages, unfortunately.

Busuu
Join millions of registered native speakers teaching each other languages of the world! Extra resources for paid members. Courses in six stages recognized by CEFR.

Duolingo
Popular free site and app that teach languages through reading, writing, speaking, and listening drills, article translation, and more.

Babbel.com
Similar to Rosetta stone, but much less expensive. Limited number of languages. Sort of a cross between Rosetta Stone and Duolingo. Excellent program.

Yojik
U.S. government language resources designed by professionals for U.S. Foreign Services. Huge number of languages. Privately maintained. Original site here.


About Language

Linguistics
The scientific study of language: form, meaning, context, grammar, stylistics; role in cognition, psychology, biology, ontology; etc.

Language Families
Trees and charts show the familial relationships between world languages. Includes information on a conjectured human Mother Language. More here.

Ethnologue
Rigorous, in-depth, authoritative, searchable information on all known human languages (more than 7000). Regularly updated.

Omniglot
“The online encyclopedia of writing systems and languages.” Details on 1000+ languages, 180 writing systems. Overflowing with tantalizing info. Amazing site.


Other

Google Translate
Amazing AI that translates just about any major world language into any other in real time. Great for formal translations (important documents, etc.).


BBC: Languages
“A taste of the 20 languages most widely spoken in the world to help you decide [which one(s) to study].” Good place to start. No longer updated, unfortunately.

Lexicool
Database of links to 8000+ language dictionaries, translation sites, and subject-specific glossaries. Includes quick translation page.