In Fear I Trust (Android)
CheatingDome.com
Various Tips and Tricks
To check out the clues for puzzling puzzles use 'Retrospection mode'.
In Retrospective mode you can also see hotspots for items that you can pick up and/or objects with which you can interact.
Skip audio diaries they are not needed to solve puzzles. But all means if you're not interested in the story check them out.