Groningen

Lights (at sea) - geodienst.github.io/lighthousemap/
Interactive map of lighthouses.

Chordify - chordify.net
address: Zuiderpark 14 9724AG
email: android@chordify.net
Chords.

Transformation of music videos into guitar chords.
We set the song in search, select from the offered, watch the video, listen and in parallel the chords are broadcast.