An Stòr-dàta Briathrachais Gàidhlig: http://www2.smo.uhi.ac.uk/gaidhlig/faclair/sbg/lorg.php
Dictionary of the Irish language: based mainly on old and middle Irish materials. (1913-1976). Dublin: Royal Irish Academy. Online at: http://edil.qub.ac.uk/dictionary/search.php
Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
Robert Farren, PIE culture words collection, 2017
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This map shows the etymological links in a geographic context.