What does HackerNews think of core?

Code is still here and usable for c9: https://github.com/c9/core

I bet it's hella outdated and full of security issues now though.

An older version of version of the Cloud9 core SDK is open source at https://github.com/c9/core. Instructions for downloading an older offline version of the CS50 IDE are available at https://cs50.readthedocs.io/ide/offline. Unfortunately the new versions are not open source at the time of this writing.

Sadly I second that. Also I had problem with their "DDoS protection" which detected false-positive DDoS attack. I got instance suspended after 6 days after payment for next month without any refund. They noticed "weird" traffic to my instance where I had installed Cloud9 [0][1] and I assume built-in terminal was flooding instance with TCP-SYN packets when I was using it. I am glad that I haven't left anything inside, because I lost access to this instance and storage. Before that, I thought such protection rather stops instances not drops them with mounted SSD disks to do not impose an impact on other instances.

[0]: https://github.com/c9/core

[1]: https://aws.amazon.com/cloud9

It's never lead to problems for me. However, some of my coworkers decided not to use c9 due to latency (which has never bothered me for some reason.)

I use the ssh-workspace feature and do my work in an EC2 instance. I've also been playing around with running a local c9 build (https://github.com/c9/core). Not sure that their license would make this viable for commercial work, but ofc there's no latency / connection requirement if you're running it locally.

Off-topic, you could even run c9 locally in a Chromebook if you were using Crouton -- and without having to install another desktop environment. I do most of my work on a desktop, but if I ever get together a mobile development environment this may be what I do.

I use c9.io, and also a self-hosted version (https://github.com/c9/core) occasionally.

Using even the free c9 service, connecting to your own server via SSH, you can create a fantastic collaborative development environment.

Although I do most of my development locally, cloud IDEs are perfect for the remote pair-programming use-case - they're far better than screen-sharing.

Big c9sdk[0] fan here. I don't have high hope, because last time I tried atom on my i7 it ran like a dog.

[0]: https://github.com/c9/core

It used to be messy but now it's largely just:

    git clone git://github.com/c9/core.git c9sdk
    cd c9sdk
    scripts/install-sdk.sh

https://github.com/c9/core

It is most definitely open source it is just not unconditional, maybe that will change now.

https://github.com/c9/core