Project JDS is a handy package to help you learn the Japanees basics. With this you can learn back and from hiragana, katakana and romanji. There is an option to show nigori and/or the maru of characters if any. Seeing how it’s written, hear how it’s pronounced and make your own set on the fly.
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Thanks to http://www.dev-fr.org for the news.

AEP-Emu (DE/EN)
DMG Page (DE)
Indie Retro News (EN)
Retroguru (EN)