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The sources for the tools are at:

https://github.com/vcstools/  (You would need all of those, vcstools, rosinstall, wstool)
https://github.com/ros/rosdep

They can be installed from source using

python setup.py ... (options)

However using the pip based install is more convenient.

For installing python packages without sudo privileges, I recommend looking at the virtualenv and virtualenvwrapper projects, and then use pip as suggested in the other answer:

pip install -U rosdep
pip install -U wstool

However installing virtualenv/virtualenvwrapper nicely also requires root privileges, but those are packaged for most distributions, so maybe you can ask your admin nicely to install those if they are not already installed.