NJStar specializes in developing Asian language software for both Windows and internet applications. One of this software is NJStar Word Processor, a software used for typing and reading Japanese and Chinese characters. Even if it is a Shareware version, it is quite complete and you can use almost all the functions available in the normal version. It include a Japanese English dictionary and a Kanji tool.  

http://www.njstar.com/cms/njstar-japanese-word-processor

          NJStar Communicator enables Chinese, Japanese and Korean (CJK) language input, display, print and conversions on your English or other western Windows. There is no need to reboot or install a separate Microsoft Chinese/Japanese/Korean Windows any more!

The software allow you to:
-Read and type Chinese/Japanese/Korean text in your favourite ICQ or MSN / AOL / Google / Yahoo Instant Messenger; making Chinese, Japanese and Korean friends has never been easier!
-Read and write Chinese, Japanese and Korean email messages in Outlook, Outlook Express, Eudora, Hotmail, Gmail, Yahoo Mail or any web based email client etc...
-Apple's iPhone and iPod are not able to display CJK dbcs encoded Song titles and artist's name in iPhone/iPod. NJStar Communicator can help you to convert the Song titles in iTune from any dbcs encoding to Unicode. Once synchronized to iPhone/iPod, CJK titles will be displayed correctly
-Compose Word documents, Excel spreadsheet in Japanese, Chinese or Korean language, and Correspond with your clients in Japan, China/Taiwan/Hong Kong and Korea.

http://www.njstar.com/cms/njstar-communicator

              If you want to read Japanese web pages, but your Japanese isn't perfect, you might be interested in jBrowse. It's a plugin for Microsoft Internet Explorer that adds furigana and word definitions to Japanese web pages. It's also a Japanese dictionary and kanji tool.And it is totally free.

http://www.jbrowse.com/products/jbrowse/index.shtml