Eclipse Che allows anyone to contribute to a project without installing software. Che defines a new type of workspace that is composed of projects and runtimes, making its state distributable, portable and versionable. We use VMs, containers, and Web services to bring repeatability, consistency, and performance to workspaces.
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Pro SSH + terminal
Built-in terminal with root access so you can make changes to your running machines. Being able to SSH into the workspace so you can use a desktop IDE is handy.
Pro Custom commands
You can package up custom commands with your workspace and then use them (or share them) with everyone else.
Pro Docker runtimes
Pro GIT and SVN VCS support
Projects can be easily imported from any Git or Svn repository hosting service.
Pro Reproducible environment
Pro Portable workspaces
The workspace in Che includes project sources, IDE and the runtime. So if you hand your Che workspace definition to another user and they execute it they will get everything they need to build, run and debug the project.
Also the runtime is in a Docker container so it will work even if the second user is on a different OS than the original user who shared their workspace with them.
Che does a nice job to automatically map the service:port running in the Docker container (e.g. tomcat on 8080) to the Docker port it actually uses (something in the ephemeral range). You never need to figure that out - it's just made available when you run your server.
Pro Merge tool for VCS
Con Slow runtime
Online IDE is much slower than desktop one.