1. Duolingo feels like a game and from time to time it will suprise you with funny bits about life in Sweden.
2. SAOL is great when learning conjugation and declination.
3. Svensk ordbok comes in handy with new words and their pronunciation.
4. Bluefire Reader/Aldiko/PocketBook Reader are not language apps, but e-book readers. Since Swedish libraries provide access to thousands of e-books, you will need one of them to use that amazing opportunity.
5. Good old Google Translate. I am sure you already know that it does not only translate text, but also pictures and voice! All I had to do is point my phone’s camera at this bottle in order to know it’s made of strawberries. Isn’t that great?