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The DSpace Git repository is very new (Jan 2012) so I can't give a lot of detail at the moment. Also, I've not yet had the opportunity to setup Git on my development machines. I'll be providing more information on this option in the coming months (Feb-April 2012).
Build Tools
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Utilities necessary for deploying an instance of DSpace
Maven
The Apache Maven project is a software development tool targeted primarily toward dependency management but also helps to keep code and projects well organized. For more information on Maven please check out the Apache Maven website. This is a required build tool for working with DSpace source code (and is not required for the pre-built versions that can be downloaded). If you're reading this tutorial and are wanting to setup an IDE for working with DSpace, this tool will be a prerequisite.
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This an Eclipse plugin which will allow for starting/stopping/restarting tomcat from within Eclipse and will also enable debugging of DSpace source code from within Eclipse.
oXygen XML Editor
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XMLUI development
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This plugin won't be fantastically useful unless you plan to be doing some development within the XMLUI interface driven by Apache Cocoon. If you will be doing work in Cocoon or on themes for DSpace, this is (in my experience) a very valuable tool.
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