What are some alternatives?
When comparing CellSend and FilePizza, you can also consider the following products
Pushbullet - Pushbullet - Your devices working better together
qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Transmission - Transmission has the features you expect in a BitTorrent client: encryption, a web-based interface...
AirMore - AirMore is a cross-platform toolset that can help you manage any Android device wirelessly.
Send Anywhere - Send whatever you want, wherever you want