Main download site. This is where you find the source tarballs as well as older releases.
Don't forget to download the framework sources as well.
Packages and Ports
libdbi is included with a variety of GNU/Linux and Unix-based operating systems. Usually they also carry at least the most popular drivers. For a detailed listing please see the download page of the libdbi project.
The libdbi drivers do not have external library dependencies except libdbi itself and the client library of their respective database engines. They are implemented in plain C. They require dynamic linking capabilities which are present in most if not all contemporary end-user operating systems. Chances are good that a simple
./configure --with-drivername && make && make installis all it takes to port a driver to your platform.
If you are a developer looking for the latest bleeding-edge version of libdbi-drivers, you can retrieve the libdbi-drivers source code from CVS.