One of these tools is the book titled Enciclopedia Heraldica y Genealogica Hispano-Americana by Alberto and Arturo Garcia Carraffa. I had been looking for this book online for a while now and was recently able to find a few of its many volumes available to download as a pdf file.
From the website Internetarchive.com the volumes are available to either read online or to download.
Volume 1 link: http://archive.org/stream/enciclopediaher01garc#page/268/mode/2up
Volume 4 link: http://archive.org/stream/enciclopediaher04garc#page/n5/mode/2up
Volume 8 link: http://archive.org/details/enciclopediaher08garc
Also, here is the link to the site’s “About” page for more information on this non-profit organization: http://archive.org/about
On the site, there is also the option to create a virtual library card, which I am sure all of us genealogists and researchers will find useful.