Boasting a built-in package manager, smart/fast autocomplete, and component previewing, Reacto is an interesting option if you do React work all-day-every-day. Here's the why:
There is absolutely no free software, all-included for React development. The idea is to create the right tool for everyone, to build ideas faster. This is a community project, using plain React code. Anyone can contribute and make it better. Anyone can suggest ideas and help everyone having the perfect tools in their hands. This is what Reacto aims to be: useful.