NuBux
NuBux has got to be the simplest account interface imagineable. Register with an email address and password, and it gives you $1,000 to play with (demo system, obviously). You can spend to other email addresses, see a list of your transactions, and inspect each individual transaction. That's the whole thing. Open source. MIT license. A product of Pelle Braendgaard and Stake Ventures Inc.
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