Technically, gnome-keyring is not a GUI tool. Seahorse is. And gnome-keyring infrastructure can be accessed via command line, using this project.

This is using the Python bindings that Rinzwind mentions in his comment, and using this tool, you can simply do this:

./gkeyring.py get -s myserver.com -p ftp -u user

This will look for all keyring items concerning server myserver.com
with protocol ftp and username user.

as mentioned in this blog.