TOR was available in a PPA for Ubuntu which has been deleted. There is also an official TOR Ubuntu repository which unfortunately has also not been updated for Maverick, just like the repositories I mentioned above. But the Lucid packages work just fine - I'm running it on Maverick for a month now and everything works.
Some GIT servers support the http protocol but some don't and if you're behind a firewall like me (at work - so I don't have control over it and most ports are blocked) you basically can't access GIT.
Ziproxy is forwarding, non-caching, compressing HTTP proxy server coming to the rescue of Linux (bot 32 and 64 bit) users with slow internet connections. Basically it squeezes images by converting them to lower quality JPEGs or JPEG 2000 and compresses (gzip) HTML and other text-like data.
Ever found yourself in a public place, wanting to use the internet, but scared of privacy issues? well This is the solution.
If you have a home machine with Ubuntu (or pretty much any linux distro) you can download and install an SSH server which allows you to effectively "dial in" with a secure tunnel from another machine.
A small guide on how to install packages while sitting behind a proxy server. I've explained the installation through the UI based Synaptics Pacakge manager instead of the normal apt-get commands.