Here's a description straight from the website's home page:
In addition to finding activity ideas, you can also submit ideas you have & they may be posted on the site.
"What is OTPlan (Occupational Therapy Plan)?
The concept is pretty simple: OTPlan is an activity idea and treatment plan search engine. The site matches the skills you want to work on, with the materials you have, to a detailed treatment activity that will help you strengthen certain skills. Each activity details the purpose, materials needed, process, rating for the activity, and comments by people just like you."