It was pretty challenging finding these free language ebooks especially ones that had good reviews. It most likely won't make you fluent in the language but at least something to learn the basics from. All these ebooks were free at the time of posting.
French -
French: Learn French For Beginners Including French Grammar, French Short Stories and 1000+ French Phrases - US, AU
French Phrase Book: The Ultimate French Phrase Book for Traveling in France Including Over 1000 Phrases for Accommodations, Eating, Traveling, Shopping, and More - US, AU
Spanish -
Conquer Basic Spanish: A Short Introduction To Beginners Spanish, Including Spanish Grammar, Verbs and Vocabulary (Learn Spanish Book 4) - US, AU
Spanish for Geniuses:Beginner grammar and vocabulary (Spanish for Geniuses series Book 1) - US, AU
Others -
Italian Phrase Book: The Ultimate Italian Phrase Book for Travel in Italy Including Over 1000 Phrases for Accommodations, Eating, Traveling, Shopping, and More - US, AU
GERMAN: ADVERBS FAST TRACK LEARNING.: The 100 most used German adverbs with 600 phrase examples. - US, AU
Thanks. The Italian one sounds interesting