|License||Proprietary (free of charge)|
|Platforms||Web, Android, and iOS|
Online picture sharing
Flickr is a photo sharing website which was owned by Yahoo for a long time, but Smugmug as of 2018. It is interesting as it hosts geolocated, open-licensed pictures (note that not all pictures are open-licensed). Flickr also uses OSM maps for some parts of the world, for example in Beijing and Baghdad.
Relation with OpenStreetMap
Some OpenStreetMap applications and users host their pictures on Flickr. As Flickr offers a machine tags system, you can mark a picture with
openstreetmap tag, to make it easy to find. You can also mark an OSM feature with flickr=URL of the picture to associate a Flickr picture. These pictures can be retrieved using the following links:
Application using Flickr
Several applications make use of Flickr pictures. Here are some of them.
Web application built by User:Pgiraud.
Helps user to link easily Flickr photos to elements on the map. Built with d3js on top of iD editor for interaction.
Source code is on github : https://github.com/pgiraud/flickr4osm
This web application is made by 3liz to help contributors to link pictures from their Flickr Account to OpenStreetMap objects. You can log in with your Flickr account, and then you will be able to use a map to search for OSM objects and create machine tags easily. http://demo.3liz.com/osmflickr/
Source code is on github: https://github.com/3liz/osmflickr
Photos on Flickr can be given machine tags to link to a specific object in OSM. Flickr will read some of the tags of that object to describe the photo.
eg to link to an OSM way / node:
More details: 
- flickr=* - to link a Flickr picture to an OSM object
- Photo mapping - Using pictures to describe features in OSM
- Photo linking - Create links between OSM features and external pictures
- Geotagging Source Photos - Add coordinates information on non-geolocated pictures
- Mapillary - Crowdsourced Street Level Photos