I've found a treasure trove of graphic organizers at these websites:

Graphic Organizers from EdHelper
You don't have to be a member of EdHelper to have access to these graphic organizers.
Thinking Maps
Thinking Maps integrate thinking skills and mapping techniques. Learning to use these strategies helps students develop good writing skills. These techniques also help students become better learners as they develop life-long skills that help them to study.
Lesson Plan: Using Graphic Organizers to Generate Genre Definitions
Students will: 1. Listen to or read a variety of stories. 2. Work individually or in groups to complete graphic organizers that will help them focus on elements within different types of stories. 3. Write definitions for a variety of story types to include one or more of the following: fables, fairy tales, folktales, legends, myths, and tall tales.
Education-World Graphic Organizers
Venn diagrams, family tree chart, concept maps, comparison chart, event map, spider map, and KWL charts
Eduplace Graphic Organizers
Graphic Organizers at Education Place, Houghton Mifflin's online support site.
Region 15 Graphic Organizers
This site has many graphic organizers, including some for friendly letters, journal writing, and mathematics.
Clear Sky Elementary School
This site has a great list of links about graphic organizers.
Houghton Mifflin Harcourt Education Place Graphic Organizers

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