Welsh-English / English-Welsh On-line Dictionary
- By the Department of Welsh, University of Wales, Lampeter. With grammatical markers and sound files.
- http://www.geiriadur.net/

Welsh Searching Lexicon
- Requires Forms Support.
- http://www.cs.cf.ac.uk/fun/welsh/LexiconForms.html

Dictionary of the Welsh Language
- The first standard historical dictionary of Welsh. Includes a description, publications and availability and a sample page.
- http://www.aber.ac.uk/~gpcwww/

Linguru Welsh-English Dictionary Software
- Free software and online services to help learn Welsh in an interactive internet community.
- http://www.linguru.com