Zoho Invoice

Zoho Invoice completely shocked the tech industry recently by making their wildly powerful, highly mature invoicing software absolutely, 100% free for everyone, forever. While Wave is also free, Wave makes money on payment processing. Zoho simply gives the software away as a "loss leader" to get small businesses hooked into the massive, sprawling Zoho ecosystem. Because it was originally a paid enterprise tool, it is unbelievably feature-rich for a free product. It handles complex multi-lingual invoicing flawlessly. A user in India can instantly generate a perfectly translated invoice in French, billed in Euros, and send it to a client in Paris. The software automatically handles the live currency exchange rate calculation in the background. It also features incredibly deep integration with Zoho CRM. A salesperson can close a massive deal in Zoho CRM, and the system instantly pushes the data to Zoho Invoice, completely eliminating the silo between the sales department and the billing department. Furthermore, it offers a beautifully branded "Client Portal" where customers can log in to view their entire historical statement of work and pay in bulk.