croc is a tool that allows any two computers to simply and securely transfer files and folders. AFAIK, croc is the only CLI file-transfer tool that: allows any two computers to transfer data (using a relay), provides end-to-end encryption (using PAKE), enables easy cross-platform transfers (Windows, Linux, Mac), allows multiple file transfers, allows resuming transfers that are interrupted, does not need a local server or port-forwarding, is faster than wormhole, rsync, scp through compression and multiplexing (speedups 1.5x to 4x), and supports IPv6.

WWW: https://schollz.com/blog/croc6
