Here is a selection of charts and organizers that you and your students will find helpful for many language activities. Many of them are used in the ESL Voices lesson plans.
KWL Charts
The KWL chart is the easiest way to help students organize their thoughts about a new topic. It is useful for pre-reading, while-reading and post-reading activities. It may also be used with the other skills.

Example K-W-L chart from Instructional Strategies

Advanced K-W-L chart-MSU
Pre-Reading Organizer Charts

Pre-reading Organizer By Scholastic

Pre-reading Organizer By McGraw-Hill Company.
Vocabulary Word Charts
These are great for teaching students new vocabulary, and the parts of speech.

Vocabulary word chart by Freeology

Color Vocabulary Map by Enchanted Learning
Debate Charts
Use these for student debates, or for organizing a topic.

Pros and Cons Scale Chart by TemplateLAB
WH-Organizers

WH-chart from Enchanted Learning.
Main Idea/Supporting Facts

Topic, concept or theme By Write Design.
Brainstorming Charts

Sample Brainstorming chart by UIE.
Brainstorming chart by Very Novel.com
MSU: Advanced KWL Chart
Education Oasis: Pair-Think and Share-The 5Ws and How-Cluster Web
Enchanted Learning: Color Vocabulary Chart-Star Chart
TemplateLAB -Pros and Cons Chart
UIE: Brainstorming Chart
Very Novel.com: Brainstorming Chart