Ranked in these QuestionsQuestion Ranking
Pro Fault tolerance for large files
Resumable.js splits each file into smaller chunks, this way if the upload of a chunk fails, uploading is retried until the procedure completes. This allows uploads to continue even after a network failure either locally or to the server. It also allows users to pause, resume and even recover uploads without even losing state.
Pro Good backend support
The backend can be found in many languages and for many frameworks.
Pro Free and open source
Resumable is completely free and distributed under the MIT license.
Con Wont let you add files programmatically
You can add files by binding to a file input or a dropzone, but you cannot add files programmatically.
Con Limited browser support
Resumable.js only supports Firefox 4+ and Chrome 11+.