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OpenSourceBilling or OSB is a simple, open source web application for creating and sending invoices, receiving payments, managing clients, and tracking and reporting. There’s no need to pay for these services because OSB does it all for free and easily. OSB can produce reports of sales, payments and collected revenues, and simply makes billing and invoicing hassle-free. OSB comes with plenty of built-in features, such as recurring invoices, exporting to PDF, time tracking, receiving...

Fixer is a lightweight and developer-friendly API service designed to provide real-time and historical foreign exchange rate data for a wide range of global currencies. It aggregates financial data from multiple sources, including institutions like the European Central Bank, to deliver accurate and frequently updated exchange rates. The API supports over 170 currencies and offers multiple endpoints that allow developers to retrieve latest rates, perform currency conversions, and analyze historical trends over time. One of its key strengths is its simplicity, as it uses straightforward RESTful endpoints and JSON responses that can be easily integrated into web or mobile applications. ...