saythanks.io
SayThanks.io ☀ Spreading Thankfulness in Open SourceSpreading Thankfulness in Open Source™. Provides a handy URL for you to share with your open source projects— it encourages users to send a simple thank you note to you, the creator of that project. This simple link can be added to READMEs and project documentation. Then, you can enjoy a nice inbox of very small but thoughtful messages from the happy users of the software that you've toiled over. :). Register Your Inbox of Thankfulness. Create Your Thankfulness Inbox. Access Your Thankfulness Inbox.
http://www.saythanks.io/