Here is a masterpost of MOOCs (massive open online courses) that are available, archived, or starting soon. I think they will help those that like to learn with a teacher or with videos.  You can always check the audit course or no certificate option so that you can learn for free.

American Sign Language

• ASL University
• Sign Language Structure, Learning, and Change
  

Arabic

• Arabic for Global Exchange (in the drop-down menu)
  
• Intro to Arabic
• Madinah Arabic
• Moroccan Arabic
• Arabe (taught in French)
  

Catalan

• Intro to Catalan Language & Society
  
• Intro to Catalan Sign Language
  

Chinese

Beginner

• Basic Chinese I. II, III, IV , V
• Basic Mandarin Chinese I & II
• Beginner’s Chinese
  
• Chinese for Beginners
• Chinese Characters
  
• Chinese for HSK 1
• Chinese for HSK 2
• Chinese for HSK 3 I & II
  
• HSK Level 1
• Mandarin Chinese
  
• Mandarin Chinese for Business
• More Chinese for Beginners
• Start Talking Mandarin Chinese
• UT Gateway to Chinese
  
• Chino Básico (Taught in Spanish)
  

Intermediate

• Chinese Stories
• Intermediate Business Chinese
• Intermediate Chinese Grammar

Dutch

• Introduction to Dutch

English

• Online Courses here
  
• Resources Here

Faroese

• Faroese Course
  

Finnish

• A Taste of Finnish
• Basic Finnish
• Finnish for Immigrants
• Finnish for Medical Professionals

French

Beginner

• AP French Language and Culture
• Basic French Skills
• Beginner’s French: Food & Drink
• Diploma in French
• Elementary French I & II
• Français Interactif
  
• French in Action
• French Language Studies I, II, III
• French: Ouverture

Intermediate & Advanced

• French: Le Quatorze Juillet
  
• Passe Partout 
• La Cité des Sciences et de Industrie
• Vivre en France - A2
  
• Vivre en France - B1
  

Frisian

• Introduction to Frisian (Taught in English)
• Introduction to Frisian (Taught in Dutch)

German

Beginner

• Beginner’s German: Food & Drink
  
• Conversational German I, II, III, IV
• Deutsch im Blick
  
• Diploma in German
• German at Work
  
• Rundblick-Beginner’s German

Intermediate

• German: Regionen Traditionen und Geschichte
• Landschaftliche Vielfalt

Gwich’in

• Introduction to Gwich’in Language
  

Hebrew

• Biblical Hebrew
• Know the Hebrew Alphabet
• Teach Me Hebrew

Hindi

• A Door into Hindi
  
• Business Hindi
  
• Virtual Hindi

Icelandic

• Icelandic 1-5

Indonesian

• Learn Indonesian

Irish

• Introduction to Irish
• Irish 101
• Irish 102
  

Italian

Beginner

• Beginner’s Italian: Food & Drink
• Beginner’s Italian I
• Introduction to Italian
• Italian for Beginners 1 , 2, 3 , 4 , 5, 6 

Intermediate & Advanced

• AP Italian Language and Culture
  
• Intermediate Italian I
• Advanced Italian I
• Letteratura italiana
  

Japanese

• Genki
  
• Japanese JOSHU
• Japanese Pronunciation
• Sing and Learn Japanese
• Tufs JpLang

Kazakh

• A1-B2 Kazakh (Taught in Russian)

Korean

Beginner

• First Step Korean
• How to Study Korean
• Introduction to Korean
  
• Learn to Speak Korean
• Pathway to Spoken Korean
  

Intermediate

• Intermediate Korean

Nepali

• Beginner’s Conversation and Grammar

Norwegian

• Introduction to Norwegian
• Norwegian on the Web

Portuguese

• Curso de Português para Estrangeiros 
  
• Pluralidades em Português Brasileiro
  

Russian

Beginner

• Easy Accelerated Learning for Russian

Advanced

• Reading Master and Margarita
  
• Russian as an Instrument of Communication
• Siberia: Russian for Foreigners

Spanish

Beginner

• AP Spanish Language & Culture
  
• Basic Spanish for English Speakers
  
• Beginner’s Spanish: Food & Drink
  
• Introduction to Spanish
• Restaurants and Dining Out
  
• Spanish for Beginners 1, 2, 3, 4, 5, 6
• Spanish Vocabulary

Intermediate

• Spanish: Ciudades con Historia
  
• Spanish: Espacios Públicos
  

Advanced

• Corrección, Estilo y Variaciones 
• Leer a Macondo
  
• Spanish:Con Mis Propias Manos
  
• Spanish: Perspectivas Porteñas

Swedish

• Intro to Swedish
• Swedish Made Easy 1, 2, & 3

Ukrainian

• Read Ukrainian
• Ukrainian Language for Beginners

Welsh

• Beginner’s Welsh
• Discovering Wales

Multiple Languages

• Ancient Languages
• More Language Learning Resources & Websites!
  

Last updated: April 1, 2018