A very good online beginners course from NTNU (the university in Trondheim.). Instructions both in English, Spanish and Polish.
This is a really good place for learning basic words and phrases in Norwegian. There are hundreds of phrases and audio spoken by native speakers. In addition you will find flashcard and multiple choice learning methods. With small “chapters” it is possible to learn a little every time you visit the website.
Interactive exercises based on the book På vei. Of course it’s best if you have the book as well, but I will especially recommend the listening exercises. These you can benefit a lot from. A slightly negative thing is that all comments are only available in Norwegian. So even if this is a beginner’s book, the difficulties with understanding comments make the exercises more suitable for intermediate learners.
Interactive exercises based on the book Stein på Stein. Intermediate level, and with good listening exercises. A slightly negative thing is that all comments are only available in Norwegian.
These online grammar exercises from the university in Oslo are good for intermediate learners. Everything is in Norwegian, so you might benefit from a good grammar book as well as a dictionary.