- Cymdeithas Madog
 - Welsh Studies Institute of North America, Inc. A tax-exempt, nonprofit organisation dedicated to helping North Americans learn, use, and enjoy the Welsh language. - Kyfieithu
- Volunteer-driven project to translate the KDE graphical environment for Linux into Welsh.
- Linguru
- Offers a free downloadable Welsh-English dictionary with content created collaboratively by users.
- Talk Tidy
- Online dictionary of Wenglish, spoken mainly in the valleys and townships of South Wales.
- University of Wales, Lampeter
- Welsh Course
- Offers an online course which helps in developing Welsh conversational skills.
- Welsh Language Society
- Political pressure group for the Welsh language.
- Welsh to English Lexicon
- Online English-Welsh lexicon and translation dictionary, letting you look up whole or partial words in either language. From Cardiff University.
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