The Irish Washerwoman Sheet Music for Tin Whistle
Irish Lullaby | Free Sheet Music for Easy Piano - http://makingmusicfun.net/htm/f_printit_free_printable_sheet_music/irish-lullaby-piano-solo.htm
blank tin whistle (fife/Irish Flue/ ect.) sheet music for beginners or anyone who can't read music yet
color coded free violin sheet music for Twinkle Twinkle Little Star
Fingering charts for Tin Whistles in C and D. Lots of tabs here.
DADGAD Guitar Open Tuning Chord Chart
Irish Flute / Penny Whistle
Expert Irish Tin Whistle Lessons/ Tutorials from Online Academy of Irish Music with Thomas Johnston.
Free printables of basic charts and worksheets, such as biographical outlines, family group sheets, and more.
Hark! the Herald Angels Sing Sheet Music for Tin Whistle (I love how the finger chart is below each note on this site. Lots of songs!)