What is the crowd's opinion of zkanji?

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As they said you, nowadays most applications are on web, but if you want an standalone offline software,you might want to take a look to ZKanji

On ZKanji you can set your kanji and vocabulary groups and testing (both writing or selecting from different choices)

I know a free open source application called ZKanji that is a search/study tool/list builder for kanji, you can search by any means, pronunciation, stroke order, radicals, or even N1-N5 ranking. It's really cool actually. http://zkanji.sourceforge.net/ you can also separately download example sentences.