Xamarin Forms Labs is a open source project that aims to provide a powerful and cross platform set of controls tailored to work with Xamarin Forms.
Resumable.JS Introduces fault-tolerance into the upload of large files over HTTP by splitting each file into small chunks that can be re-sent. Additionally, it allows for users to pause, resume and even recover uploads without losing state.
DropzoneJS is an open soure library that provides drag’n’drop file uploads with image previews. It is also available as an AMD module.