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The University of California Los Angeles offers a free archive of teaching resources (including downloadable/printable lessons in pdf, audio files, video files, dictionaries, computer programs/software, games and more) to help learn vocabulary, grammar, reading, writing, and conversational language skills in over 100 less commonly taught languages such as:

Afrikaans  
Arabic
Cherokee  
Danish  
Estonian  
Greek
Hebrew
Hindi  
Indonesian  
Inuit  
Japanese  
Latvian  
Maori  
Navajo  
Norwegian  
Polish  
Samoan  
Tagalog  
Urdu  
Zulu  

Look for the K-12 Gateway that offers links to free resources online and to materials that are available from libraries/retailers.