If you ever wanted to play chess without looking at the board, or just improve your visualisation skills, but you don't know how to start, then EyeGambit is the App for you. It currently has 5 tools to help you train: 
Square Recognition - Get to know the board better and instantly recognise the square and what color it has.
Move Recognition - Identify the moves you hear or see instantly.
Piece Movement - Train the movement of each piece individually, both by moving the piece to a target square or answering questions about its position.
Lichess puzzles - Doing puzzles but with the added difficulty of EyeGambit to train your visualisation skills on top of your tactical skills. No registration or log-in to Lichess is required for this functionality (The option to log-in will be added when other functionality of Lichess is integrated that does require it)
Play Against AI - The ultimate challenge is to actually play a game. You can still peak at the board when needed, but with time you will be able to do more moves without looking.

Apart from the training, there is also a campaign to follow a progression to learn the skills (currently only for square recognition but more campaigns will follow)

More features to come!