The goal of this project is to allow anyone to send and receive postcards from all over the world! The idea is simple: for each postcard you send, you will receive one back from a random postcrosser from somewhere in the world.

There are lots of people who like to receive real mail. Receiving postcards from different places in the world (many of which you probably have never heard of!) can turn your mailbox into a box of surprises — and who wouldn't like that?

Our goal is to provide the optimal currency conversion tool, uncompromised by search engine optimization and promotion of other services like money transfer and stock trading. Currency World was made by the team behind Time.is, the world's most trusted website for exact time. Dozens of currencies (fiat as well as crypto-) already paired up as shortcuts. No API as far as I can tell.

Described as the Craig's List for science.