Fabio Marzocca <thesaltydog@gmail.com>

Benoît Dejean  <benoit@placenet.org>

Paolo Borelli <pborelli@katamail.com>

Igalia (rings-chart nad treemap widget) <www.igalia.com>

Thanks:
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Dennis Cranston
Beniamino Caputo
Andrea Abelli
Sean Montel
Piotr Szotkowski
Francesco Accattapà