Ajapaik
Ajapaik is a an open source crowdsourcing platform and mobile app for geotagging and rephotography. By April 2018 the platform has more than 125 thousand historic images from mostly Estonian public collections, more than 8000 users have helped to geotag almost 72 thousand images, there is more than 8000 rephotos made.
See more:
Ajapaik short introduction in Wikipedia (Estonian)
Contact:
Vahur Puik
tel. 50 34 241
ajapaik.ee
www.facebook.com/ajapaik