Framadrop is a privacy-friendly and libre photo sharing service, run by French privacy campaigners Framasoft.
If you enjoy using the service you can donate to Framasoft, but that’s entirely optional.
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Wormhole is a browser-based tool that allows people to instantly share files with end-to-end encryption. The service uses WebTorrent under the hood and is free to use. BitTorrent will speed up transfers but people are not required to keep their browser windows open if files are smaller than five gigabytes.
BlackHole is secure, server-less file transfer that works with blockchain technology. It's an open-source project and available for Windows and Mac.