Mix of grammar, workbooks, old language books etc. All pdf. I haven’t used any of them yet so I don’t know how good/easy to use they are.
- Basic Irish : A Grammar and Workbook – Nancy Stenson [also available here]
- Intermediate irish : A Grammar and Workbook – Nancy Stenson
- Colloquial Irish: The Complete Course for Beginners – Thomas Ihde, Máire Ni Neachtain, Roslyn Blyn-LaDrew, and John Gillen [also available here]
Forábhar gramadaí do Progress in Irish (Grammar supplement)
- A Practical Grammar of the Irish Language – Owen Connellan [1844]
- An Introduction to the Irish Language in Three Parts – Rev. W.M. Neilson [1845]
- A Grammar of the Irish Language – W Joyce
- A Primer of the Irish Language [1845]
- A First Old Irish Grammar and Reader including an Introduction to Middle Irish – Kim McCone
- Learning Irish – Mícheál ÓSiadhail
- An Chéad Leabhar Gaedhilge : A Grammar of the Irish language – Dr Chas. H. Stanley Davis
- A Concise Old Irish Grammar and Reader – Julius Pokorny
Buntús na Gaeilge – Barbara Hillers with Bettina Kimpton (Textbook for Celtic 132: Introduction to Modern Irish
Harvard 2007)