Bashupload - Upload files from command line to share between servers
File Doge - File doge let's you share your files with ease for fully free without any ads.
FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.
Tresorit - Encrypted cloud storage for your confidential files. Using Tresorit, files are encrypted before being uploaded to the cloud. Start encrypting files for free.
BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.
Wormhole.app - Wormhole lets you share files with end-to-end encryption and a link that automatically expires.