www.celtic-languages.org/Manx/Getting_started - Some information and resources.
www.mannin.info/Mannin/fockleyr/help.php - Online Manx Dictionary.
www.celtic-languages.org/Manx/Resources - Manx resources, courses, dictionaries, media, etc.
www.learnmanx.com - Dictionaries, grammar, translations, audio, videos, news, etc.
en.saysomethingin.com/manx/level1/challenge1 - Audio course for beginners.
Conversational Manx, by Gell (1989)
A practical grammar of the Antient Gaelic, or Language of the Isle of Man, usually called Manks, by Kelly (1870)
Gaelg Trooid Jallooghyn: Manx Through Pictures, by Stowell (1968)
Manx, in The Celtic Languages, by Broderick (1993)