The best alternatives to CowTransfer are WeTransfer, AnyMirror, and Send Anywhere. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurreeβ The smarter, simpler way to analyze your data
WeTransfer is a file-sharing platform that allows users to easily send large files up to 2GB for free. Paid plans are also available for added features like password protection and more storage space.
AnyMirror is more than just a screen mirroring tool, it also mirrors camera, microphone, online media, local files of your phone/tablet to computer. It can be applied in teaching, meeting, live streaming, demonstration, entertainment, and more.
A tool to quickly upload files from command line and download it on other server/desktop/mobile. An alternative for SCP and FTP. Using gpg encryption makes it secure. Files stay for 7 days and are limited to 25G.
Hybrid between a centralized and decentralized system. You get a device to install at your office which co-administers your encryption keys. Every operation is verified by each the central server and the device at your office. Hacking only one of them doesn't compromise the security. Share files and messages with full control of your privacy.