Spell
Spell, formerly USD Spell, was the international spelling software for NeXTStep that automatically integrated multiple-language spelling capabilities into your existing applications. Spell could also be used as a standalone application or accessed as a service from other applications.
Spell supported eleven international languages including Danish. Dutch, English, Finnish, French. German, Italian, Norwegian, Portuguese, Spanish and Swedish.
Metrosoft
$149 two languages
$99 each additional language