Wormhole - Simple, private file sharing
Wormhole lets you share files with end-to-end encryption and a link that automatically expires.
OnionShare 2 adds anonymous dropboxes, supports new Tor addresses, and is translated into a dozen new languages
instant.io
Sharefest
ShareFest - Web based p2p file sharing built on WebRTC Data Channels API
Destructible.io
Firefox Send
Encrypt and send files with a link that automatically expires to ensure your important documents don’t stay online forever.