Folk Harp Journal - beautiful journal just for folk harps: includes articles, reviews, color advertisements, sheet music, and classifieds. This is a real treat and it comes out just 4 times a year. To get the journal, you join ISFHC.
HarpColumn - the website has useful discussion forums, classified ads, and event listings. You can also subscribe to the Harp Column, which has 6 issues per year covering topics applicable to pedal and folk harps.
Edinburgh Harp Festival free sheet music downloads. The overview page has some additional tunes (including sound files), and then the 32-page booklet is here. This is a fun way to get the feeling for what a session would be like at the Edinburgh Harp Festival!
Harp North West "JaNEWary" music challenges - free sheet music with accompanying tutorials help you add to your skills day by day. Highlights for 2019 include "Pure Imagination" and from the 2018 set, enjoy "Funky Blues"!
Marianne Bouvette has several free compositions and arrangement along with links to Youtube videos for reference.
Looking for practice session music? Try the Center for Irish Music and look at their "Common Repertoire" under Resources.
Reigning Harps - click on the "featured harp music" link on the left (print the pdf file), and click on Harp Music Archives link for music from past quarters.
Music by Karen Marshalsay - some free music and learn about some interesting new collections of music composed and arranged by 19 current scottish harpers, in 3 volumes by level (beginner/intermediate/advanced)
Tunes played by Laoise Kelly - pdf of the lead sheet (see "notation links at top right) and a sound clip from her "Just Harp" CD so you can follow along