いろどり 生活の日本語 is a series of free course books available as PDFs, along with MP3 audio files, published by the Japan Foundation Japanese-Language Institute. This book is intended to help foreign residents acquire the basic Japanese communication skills that they'd need for working and living in Japan.
The content and design of the books are very high quality, and it's hard to believe that they're free!
The series is designed for learners with A1/A2 levels on the JF standard, which is based on what kind of tasks you can accomplish using Japanese, rather than how much you know about Japanese vocabulary or grammar. A1/A2 are essentially the levels of being able to say basic greetings or use simple sentences to discuss familiar subjects. いろどり aims to help Japanese learners acquire more can-dos in communication.
This course provides well-rounded material for you to gain the reading, speaking, listening, and writing skills necessary to get by and enjoy life in Japan. Each section has a practical topic like talking about your job in Japan or how to ask for help with Japanese learning.
As of summer 2020, two books are available — 初級1 (Elementary 1) and 初級2 (Elementary 2) — and it seems like another book for 入門 (Novice) will be published sometime this fall. The content and design of the books are very high quality, and it's hard to believe that they're free! If you're a beginner and looking for practical material, they're worth checking out!