This blog contains many articles about Oracle Application Development Framework (ADF). In order to develop and run applications using ADF, you will need to install Oracle JDeveloper, which you can download from the Oracle Technology Network (here).
Each post will contain a note to let you know what version of JDeveloper was used for that post.
If you use multiple operating systems, and a mixture of 32-bit and 64-bit (like me) then you should grab the “base install” version, which is a generic JAR file that can be installed on any platform (provided you have a supported JDK). I have installed this version on 32-bit Windows and Linux, and 64-bit Windows, Linux, Mac OS X and Solaris. If you are going to use Mac OS X, you might want to check the hints here.