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I am currently learning Irish with the help of the Android application "Duolingo". It doesn't teach me the grammar; it works with translating sentences. I don't think the app is very useful; I tried it in German, my mother tongue and I often find mistakes and confusing structures. It's not easy to know if a verb is in the infinitive or in the past tense.
Are there any books or apps (for free) where I can learn the grammar of the Irish language? Also I am looking for some pronunciation rules.
One resource that may be helpful for beginners is Wombat's Irish Grammar Guide; it's just 19 pages long, so you only get the basics.
A more complete resource is Graiméar na Gaedhilge on Wikisource (in English, in spite of the title). This was originally published in 1906, so I assume some of it is outdated. However, it is one of the sources for Wikipedia's article on Irish grammar. On Wikipedia, see also Irish declension, conjugation, dependent and independent verb forms, initial mutations and syntax.
The wikibook Irish currently contains 5 lessons (work in progress) and has a number of articles on grammar.
There's also Lars Braesicke's Gramadach na Gaeilge - Irish Grammar, based on a German original: Gramadach na Gaeilge - Die Irische Grammatik.
In print, there's Nollaig Mac Congail's Irish Grammar Book (2004; ISBN 9781902420493).
