Postman - The Collaboration Platform for API Development
MultCloud - Multiple Cloud Storage Manager: Migrate, move, sync, copy, backup and transfer cloud files with MultCloud, which supports Dropbox, Box, Google Drive, Mega, OneDrive and FTP, etc.
Cloud Combine - Cloud Combine is a browser and manager for the cloud services.
Koofr - Koofr offers safe EU based cloud storage with free storage space for life and options to connect multiple cloud accounts (Dropbox, Google Drive, OneDrive) and your personal storages.
Apigee - Intelligent and complete API platform
Paw.cloud - Paw is a REST client for Mac.