Open Transactions is a solid, easy-to-use, financial crypto and digital cash library, including an API, server, and test client. It features anonymous numbered accounts, untraceable digital cash, triple-signed receipts, basket currencies, and signed XML contracts. It also supports cheques, invoices, payment plans, markets with trades, and other instruments. It uses OpenSSL and Lucre blinded tokens.
Dudle is an online scheduling application. Users are able to schedule events (such as telephone conferences and meetings) or run opinion polls (for example, to find out which sort of coffee people like the most). Unlike most other similar applications, Dudle offers enhanced access control settings, which minimizes trust assumptions in the polling server.