OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
Google Drive - Access and sync your files anywhere
Truepush - Unleash limitless possibilities with Truepush and save up to $600 monthly. Free up to 10K Subscribers on all features.
ShareFile - Secure file sharing and sync
PushCrew - Push Notifications for Websites
Dropbox - Online Sync and File Sharing