Installing
Just get yourself the Debian packages from the Files section of the Garage Project Page and open them in the maemo Application Manager.
After installation make sure you restart the browser twice.
Source Code
The source code is available in the Telar DCCI subversion repository. You can browse the repository online or check out the source using
$ svn co https://garage.maemo.org/svn/telardcci/trunk
Building
In order to build the Debian package you need a scratchbox environment. Make sure you have the build dependencies resolved. Then run (inside scratchbox)
$ dpkg-buildpackage -rfakeroot
This should generate three Debian packages: the installation package (dcci), the debug package (dcci-dbg), and the development package (dcci-dev). The development package is needed to write context data providers, i.e., browser extension shipping data to the DCCI tree. If that's what you want install the development package in scratchbox (not on the device!).