FreshBooks is cheaper than Quickbooks and has the same functionality. It even comes with a free 30-day trial that you can cancel at any time. Integrates with your business checking account for seamless expense tracking and categorization. Highly recommended.
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WeTransfer can transfer up to 2 gigabytes for free. It also has a number of great security features. These include a TLS encryption protocol for files in transit, AES 256-bit encryption for files. Keep in mind that files are deleted after 2 weeks, so ask that the recipient downloads quickly.