The Field Guide to Spotting Enclosure
Seven steps, seven questions. A short, free pocket guide for seeing the fence go up while the gate is still open. Free. Pay what you want if it helps.
Free tools
Guide · PDF 
Book · PDFEnclosure 101
A short, plain-English guide to how shared things get fenced, and how to spot it before the gate locks. Readable in under ten minutes. Free, and a suggested $5 if it helps.
Interactive Play with the model
Drag the parameters and watch a commons be defended or lost as it crosses the awakening threshold.