Learning Japanese for free

In my opinion, the way duolingo works, kinda sucks for japanese. Here are some good materials i found on internet.

• Fujitsu's Guide to Japanese - Great set of documents that teach basic Japanese communication skills. Also, You could combine all of these lessons with something like combinepdf.com for single pdf.
• Understanding the Japanese Writing System by Academia Cervena - Great introduction to differences between Katakana, Hiragana and Kanji.
• Learn Kanji in 45 minutes - How to Read and Write Japanese by JapanesePod101.com - Introduction to Kanji.
• NIHONHO eな - List of websites with Japanese learning materials.
• How to learn a language: Input by What I've Learned
• Advanced Kanji database
• Katakana Reading Practice
• All Japanese materials I use
• Kana Quiz