These files are cross-compilers for the legOS system, built aginst the RedHat 6.x libraries.
Currently, the most up-to-date instructions for the use of these files can be found in the legOS HOWTO. If you are familiar with RPM, the basic instructions are: download, su, and rpm -ivh.
The file listing below is auto-generated, showing the current list of files in this directory. To get more information about them, try the links above or download them yourself.