Marathi Dictionary — Omkar Joshi, shantanu Oak

Make sure that "check spelling" and "Languages - Marathi" are selected on right click.
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Marathi Spell Check Mobile App is available at Play Store:

https://play.google.com/store/apps/details?id=com.myapp.marathispellcheckandsanskritsandhi
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Improved wordlist is available as an extension for LibreOffice Writer
https://extensions.libreoffice.org/en/extensions/show/marathi-spellchecker