Postman - The Collaboration Platform for API Development
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Apiary - Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing
Air Explorer - Air Explorer is a software to manage all your multiple cloud drives (like Dropbox, Onedrive, Google Drive, Mega, Mediafire, Box, Hidrive, Yandex, Baidu,...) as well as WebDav and FTP connections.
Django REST framework - Django REST framework is a toolkit for building web APIs.
FileCloud - FileCloud is an enterprise file share, sync and mobile access solution.