Phone Applications (Android)
Note there may be equivalents for iOS, but I'm not sure since I don't use it.- Duolingo (kana, kanji, vocab, sentences with audio)
- Drops (kana, audio, vocab)
- AnkiDroid - Generic flashcard program
- Japanese Dictionary Takoboto
- Wanikani (kanji, website not an app but works well on mobile)
Textbooks ($)
- Genki* ( Japanese Language Series)
- Japanese for Busy People (Japanese Language Series)
- Remembering the Kanji* (Kanji Series) [link]
- Remembering the Kana* (Kana Series)
Kana Learning Tools
- Real Kana - http://www.realkana.com
- Drag-n-Drop - http://www.csus.edu/indiv/s/sheaa/projects/genki/hiragana-timer.html
- Easy Japanese - http://easyjapanese.org/kanaquiz.html
Grammar
- TextFugu* ($) - http://www.textfugu.com/
- EtoEto ($) - http://etoeto.com/
- Imabi* - http://www.imabi.net/
- Tae Kim* - http://www.guidetojapanese.org/learn/
- Visualizing Japanese Grammar - http://www.gwu.edu/~eall/vjg/vjghomepage/vjghome.htm
- Stack Exchange (for Japanese) - http://japanese.stackexchange.com/
Japanese Practice
- WaniKani ($) - http://www.wanikani.com/
- Anki*** - http://ankisrs.net/ (This one gets multiple stars for being awesome)
- Lang-8* (writing) - http://lang-8.com/
- Skype (speaking) - http://www.skype.com/en/ (Use Lang-8 to find Japanese Skype partners)
Vocabulary
- Core 2k/6k Optimized Japanese Vocabulary Deck (Anki deck) - https://ankiweb.net/shared/info/1102215805
Online Dictionaries
- Jisho.org* - http://beta.jisho.org/ or http://jisho.org/ (the beta is a new and improved version of the regular jisho.org)
- Tangorin - http://tangorin.com/
- Tanoshii Japanese - http://www.tanoshiijapanese.com/dictionary/
- Romajidesu - http://www.romajidesu.com/
- ALC - http://www.alc.co.jp/
- Weblio - http://ejje.weblio.jp/
- JLPT Dictionary - http://www.jlptdictionary.com/
- OCJS - http://www.yamasa.org/ocjs/kanjijiten/english/
Alternate Dictionaries
- Verb Conjugator* - http://www.japaneseverbconjugator.com/
- Sentence Dictionary - http://tatoeba.org/eng/
- IT Terminology (in Japanese) - http://e-words.jp/
- Advanced (Business/Industrial/Scientific) Terminology - http://www.kotoba.jp/
Japanese Learning Games
- Syndorea - http://syndorea.behemyth.com/
- Slime Forest Adventure (kana/kanji) - http://lrnj.com/
- Digital Dialects - http://www.digitaldialects.com/Japanese.htm
- Kana Invaders (v1)* - http://learnjapanesepod.com/kana-invaders/
- Kana Invaders (v2) - http://easyjapanese.org/invaders.html
Browser Extensions
- Rikaisama (Firefox Deluxe Version)* - http://rikaisama.sourceforge.net/
- Rikaichan (Firefox Standard Version) - https://addons.mozilla.org/en-US/firefox/addon/rikaichan/
- Rikaikun (Chrome Standard Version) - https://code.google.com/p/rikaikun/
Japanese Culture
- Tofugu - http://www.tofugu.com/
- Chokochoko - http://chokochoko.wordpress.com/
- What Japan Thinks - http://whatjapanthinks.com/
- Metropolis - http://metropolis.co.jp/
- Wow Japan - http://www.afachan.asia/wowjapan/
Japanese Newspapers
English
- The Japan Times - http://www.japantimes.co.jp/
- Japan Today - http://www.japantoday.com/
Japanese
- Asahi - http://www.asahi.com/
- NHK - http://www3.nhk.or.jp/news/
- NHK Easy - http://www3.nhk.or.jp/news/easy/ (another version of previous site that includes furigana)
- Rocket News 24 - http://rocketnews24.com/
Native Japanese Exposure
- Fengyunzhibo - http://www.fengyunzhibo.com/space/japan.htm
- Niconico - http://www.nicovideo.jp/
- TBS Newsu - http://news.tbs.co.jp/
- B! - http://b.hatena.ne.jp/
- 4Gamer.net - http://www.4gamer.net/
- Livedoor - http://www.livedoor.com/
- Sanspo - http://www.sanspo.com/
- Kotobank.jp - http://kotobank.jp/
J-blogs (Japanese Blogs)
- V2K Japan - http://www.v2k-jpn.com/
- All Japanese All The Time* - http://alljapaneseallthetime.com/
YouTube J-vlogs (Japanese Video Blogs)
- Bobbyjudo - http://www.youtube.com/channel/UCUDjZZt5vFib4QIot82bUbg
- CulturalExchangeChan - http://www.youtube.com/user/CulturalExchangeChan/videos
- Kyarorin - http://www.youtube.com/channel/UCGjMgcbgLpH8KO5fVl1ywkw
- Micaela* - http://www.youtube.com/user/Ciaela
- PDR - http://www.youtube.com/user/PDRKabushikigaisha
- QuickRhino* - http://www.youtube.com/user/QuickRhino
- Rachel and Jun* - http://www.youtube.com/user/MyHusbandisJapanese
- Sharla in Japan - http://www.youtube.com/channel/UCLfbmGhvu7xTHXktmMWdfvw
- Gimmeaflakeman* - http://www.youtube.com/user/Gimmeaflakeman
Immigrating to Japan
- Turning Japanese - http://www.turning-japanese.info/
Additional Resource Sites
- Nihon Shock* - http://nihonshock.com/
- Renshuu - http://renshuu.org/
- About.com* - http://japanese.about.com/
- LearnJapanese.com - http://www.learnjapanese.com/
- Japanese From Zero - http://www.yesjapan.com/
- 123 Japanese - http://www.123japanese.com/
- Nihongo Resources - http://redesign.nihongoresources.com/
- Irasshai (Video Lessons) - http://www.gpb.org/irasshai/japanese-i
- Live Mocha - http://livemocha.com/
- Remembering the Kanji Forum - http://forum.koohii.com/index.php
- Google Japan - https://www.google.co.jp/
- Fluent Future - http://www.fluentfuture.com/learn/japanese
- JapaneseClass.jp (RPG text-style learning) - http://japaneseclass.jp/
- JapanesePod101 ($) - http://www.japanesepod101.com/ (Note: they do have a free word of the day feature that is nice as well).
- iKnow (smart.fm) ($) - http://iknow.jp/
- AllNihongo Kana Tables - https://archive.travisvroman.com/kana.php
- Installing and Typing Japanese on Vista / Windows 7 (YesJapan) - http://www.yesjapan.com/install_japanese/
- Japanese Input on Windows XP - http://blog.greggman.com/blog/japanese_input_on_windows_xp/
- Japanese Input on Mac - http://www.kanjimi.com/write-in-japanese-with-mac-os-x-kotoeri/
- Japanese Playstation Manuals - http://www.jp.playstation.com/support/manual/manual_list.html
Japanese Audio Books
Japanese Audio and Podcasts
- last.fm - http://last.fm/
- TBS Radio 954 Podcasts - http://www.tbsradio.jp/index.html
- TuneIn (Japanese Radio Streams) - http://www.tunein.com
- Grooveshark (Can search for Japanese Music) - http://grooveshark.com
- サイマルラジオ (saimaru rajio/simul radio) - http://www.simulradio.jp/