Aquaterra collects, manages and processes geo-data (including mobile mapping), and realizes cartography projects (city plans, recreational maps, …). You can interactively view their collection at Back To the Map.
link: Back to the Map

Ajapaik has 103102 historic pictures, out of which 59052 pictures have been put on the map by 7342 users and 5277 rephotographs for 4851 pictures made by 178 users. In this interactive platform you can search historic view pictures from Estonian museums’ collections and curating selected images to Ajapaik, geotag pictures from places you are familiar with and rephotograph the historic views from places you visit.
link: Ajapaik