The software is available in English and French but works equally well with texts in Spanish, Portuguese, Italian, German, Dutch, Danish, Norwegian, Swedish, Finnish and Icelandic.
Here are the letters of these languages
Àà Ââ Ææ Çç Éé Èè Êê Ëë Îî Ïï Ôô Œœ Ùù Ûû Üü Ÿÿ
Ää Öö Üü ßß
Ññ Áá Éé Íí Óó Úú Üü
Àà Ãã Çç Êê Õõ á Éé í ó ú
Àà Éé Èè Ìì Îî Óó Òò Ùù
Åå Ææ Øø
Åå Ää Öö
Åå Ææ Øø
(Š) (Ž), Å, Ä, Ö
Ðð Þþ Áá Ææ Éé Íí Óó Öö Úú Ýý
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http://www.repetition-detector.com