Category: Postcrossing related
Category: Similar projects
Category: Sites we like or recommend
An Aerogramme (a letter that folds up into it's own evelope) is a wonderful way to send a message by mail. Int'l Girl Aerogrammes are wonderfully designed and come in several languages.
A travel game website dedicated to children where they can learn about other places in the world and send postcards about it.
Category: Other postcard resources
A tumblr blog of postcards mail with the answer to the question: "what are you doing, you know, more generally?"
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