Windows users please download the file ftp://ftp.cadsoft.de/eagle/program/5.1/eagle-win-5.1.0.exe and run it. This self-extracting archive will guide you through the setup process.
	Linux users please download the file ftp://ftp.cadsoft.de/eagle/program/5.1/eagle-lin-5.1.0.run and run it. This self-extracting shell script will guide you through the setup process. You may need to click on the above link with the right mouse button and select "Save Link As...".
	Mac users please download the file ftp://ftp.cadsoft.de/eagle/program/5.1/eagle-mac-5.1.0.zip and unzip it, which results in a Mac Installer. Run the installer to install EAGLE on your system.

Further download directories can be found here

Libraries	-	New and improved EAGLE part libraries
ULPs	-	User Language Programs
Projects	-	Projects from EAGLE users
Documentation	-	Various user provided documents (the official EAGLE manuals are contained in the above program installation files)
Miscellaneous	-	Various stuff

If you have files that you would like to share with other EAGLE users you can upload them.

Previous versions of EAGLE can be found at ftp://ftp.cadsoft.de/eagle/program.