featherbase: a consortium of ornithologists join their collections and make them freely accessible on-line—via Web Curios
cut-up technique: Artbreeder (previously) creates collages with your help—via Waxy

deep scatter library: stellar cartography mapping a billion stars in the Milky Way
culmen > columna > compagna colonnella > coronnel > colonel: explore etymologies with this interactive tool from the creators of Interlinear Books and Language Hat
unsleeved: an exhibit on the art of the record cover and designer Alex Steinweiss
trainspotting: an obsessive database of European rolling stock—also via Web Curios