react-papaparse
The fastest in-browser CSV (or delimited text) parser for React. It is full of useful features such as CSVReader, CSVDownloader, readString, jsonToCSV, readRemoteFile, ... etc.
easydl
Easily download a file and save it to local disk. It supports resuming previously downloaded files, multi-connection/parallel downloads, and retry on fail out of the box!
thaw.js
synthetic asynchronous processing in javascript