Gnu Tools for GNU/Linux
The
Free
Software
Foundation is the website where almost GNU tools for GNU/Linux is available. Below is the link for this website:
http://www.fsf.org/
On the above link, you will find the list of GNU tools providing each program, version, descriptions, contents. There are also packages containing several tools with all necessary information. One of the most apparent packages is coreutils which can be accessed directly under below link:
http://directory.fsf.org/project/coreutils/
To ease your tools search, you can list same by category.