BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.
instashare - Share your photos to instagram from your mac
Surge Send - File transfer and storage made easy, fast, and secure.
Frame.io Watch Folders - Accelerated, secure, & indestructible uploading to Frame.io
Parsec - Streams games locally or over the internet
Pushbullet - Pushbullet - Your devices working better together