Licenses

Morphologic dictionaries

• English, German, Russian: AOT (LGPL-2.1)
• French: Morphalou (LGPL-LR)
• Portuguese: LABEL-LEX-sw (GNU GPL 3)
• Italian, Spanish: UniMorph (CC BY-SA 3.0)

Pronunciation dictionaries

• Wiktionary (License)
• Zamia Speech (LGPLv3)
• voice2json (MIT License)
• deuPD (MIT License)
• CMU English Dictionary (CMUdict)
• CMU US English Dictionary (CMUdict)

Frequency dictionaries

• Google Books Ngram (CC BY 3.0)

Bilingual dictionaries

• Wiktionary (License)

Audio sentence databases

• The LJ Speech Dataset (Public domain)
• The SIWIS French Speech Synthesis Database (CC BY 4.0)
• PAVOQUE Corpus of Expressive Speech by DFKI GmbH. (NC SA 4.0)