Bashupload - Upload files from command line to share between servers
instashare - Share your photos to instagram from your mac
FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.
Frame.io Watch Folders - Accelerated, secure, & indestructible uploading to Frame.io
BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.
Pushbullet - Pushbullet - Your devices working better together