The JupyterLab Docker containers already contain a large number of pre-installed programs, libraries and source files. As these are constantly updated, it is hardly possible to keep an up-to-date list here. However, you can create a detailed list yourself using the following commands:
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System Packages: All packages that have been installed via the Debian package manager.dpkg -l | grep ^ii If you want to search for a specific package, you can add a search pattern:dpkg -l *gcc* | grep ^ii 
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Python: A list of all installed Python packages/modules.pip list 
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R: All packages installed via CRAN.R --no-save <<< "p<-as.data.frame(installed.packages()[,c(1,3:4)]);p[2]" 
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Node.js:npm list -g 
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Ruby:gem list