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Cymdeithas Madog
Welsh Studies Institute of North America, Inc. A tax-exempt, nonprofit organization dedicated to helping North Americans learn, use, and enjoy the Welsh language.
http://www.madog.org/
Linguru
Offers a free downloadable Welsh-English dictionary with content created collaboratively by users.
http://www.linguru.com/
Talk Tidy
Online dictionary of Wenglish, spoken mainly in the valleys and townships of South Wales.
http://www.talktidy.com/
Welsh Language Society
Political pressure group for the Welsh language.
http://www.cymdeithas.com/