Code Ocean's starter environments attempt to cover the majority of scientific use cases. If you need more than one language, you can set that up starting from a pre-existing starter environment.
Code Ocean can also support languages that don't have a pre-existing environment. To do so:
From Code Ocean's dashboard, click 'New Compute Capsule'
In the Environment tab, under 'Starter Environment' select 'Ubuntu Linux 18.04'. This will initiate a compute capsule with no scientific programming languages pre-installed. This will install just the basics, such as git and curl, so you can customize your environment.
With 'Ubuntu Linux 18.04', you can use the 'apt-get' package manager to install languages and packages, or to install other package managers to configure your computational environment.
Code Ocean provides setup instructions for a number of additional languages, as well as examples. For instance:
Installing MOSEK on Code Ocean (note that this is an optimization toolbox compatible with multiple languages)
If you have additional languages that you would like us to support, please reach out through live chat or by emailing firstname.lastname@example.org, and we will be happy to help.