Nitrous gets your project up and running lightning fast. The IDE includes not just a file browser and text editor, but a fully-functioning shell - you can even code in vim or emacs if you prefer - all from within the browser.
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Pro Desktop application
Nitrous Desktop syncs files so you can edit them with your preferred text editor and offers box management from the app.
Pro GitHub Integration
Integrates with GitHub and allows for SSH keys for secure transfer. Additionally, allows logging in with yout GitHub account.
Pro Customizable Development Environment
Pro Framework setup is painless
Installing a new Framework for programming, setting up the dev env, could turn into a nightmare, With Nitrous just create an account and jump to the write code, no setup pain at all, specially if you are in windows.
Pro World Accessible URLs - Preview Your Application
Since you are using a linux box on the internet you are able to expose your apps to the world out of the box.
No messing around with firewalls or NAT. It Just Works.
This is most useful when needing to demonstrate or work on a task with other people who are not on the same LAN as you.
There are ways of upgrading your box that don't involve spending money such as social outreach and referrals.
Pro Live online support
You can get live support and fairly quickly. If they cannot get to you fast enough you can leave a message and they get back to you within 24 hours via email or chat.
Pro Allows you to edit locally with provided Atom plugin
Nitrous.io recently developed (in open beta) a plugin for Atom called Nitrogen which allows you to work locally within Atom, utilizing all of the features and plugins you enjoy in Atom, as well as having the sync capabilities of their original desktop sync app.
In short, it's brought the power of Atom and it's extensive plugin community to Nitrous's ability to provision and maintain development/production environments all in one package.
Pro Heroku, Azure, Nodejitsu integration
Pro Erlang support
You can get erlang up and running easily.
Pro Slick UI
The interface is well designed and powerful.
Pro Collaboration features
Con Very pricey
Very pricey if you wish to use it for your regular cloud IDE and work on more than 5 projects.
Con Old free account options available beyond 1st July 2015
The old free account will only available until 1st July 2015 and going to be replaced with new ones.