The following are the most popular business diagrams on our site:
Business Heat Map 
CDSTEP Marketing Diagram 
Customer Lifecycle 
Situational Leadership Diagram 
GE McKinsey Nine Box Matrix 
Buyer Utility Map 
Cognitive Bias Codex 
5S Kaizen Framework 
Marketing Plan 
Just in Time Diagram 
Chart of Accounts Accounting Explained - Porters Five Forces
Kaizen A3 Tool 
Value Stream Map 
Five Factor Model of Personality