OpenAccounting

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 * Software
 * http://en.wikipedia.org/wiki/Comparison_of_accounting_software#Free_and_open_source_software
 * http://en.wikipedia.org/wiki/Point_of_sale
 * http://www.invoiceexpert.com
 * http://www.simpleinvoices.org
 * Currency
 * http://en.wikipedia.org/wiki/Digital_currency
 * http://en.wikipedia.org/wiki/Cryptocurrency
 * http://en.wikipedia.org/wiki/Bitcoin
 * http://en.wikipedia.org/wiki/Litecoin