MouseTool is Donationware. The author, Jeff Roush, would like you to send a U.S. $20 donation, or the equivalent in your currency, to any charity of your choice. You are not legally obligated, it is a request and doubtless Mr. Roush would not wish you to stop using Mouse Tool if you need it for health reasons and are unable to manage the full amount or even part of it. It is up to you to search your conscience and donate if you can.
