This project is supported by Ademis (http://ademis.com).
This project is in development and is not ready for production for the moment.
Ademis Feedback is a library aiming to provide an in-app user bug tracker tool. It provides the same service as Usersnap, but is Open-Source, self-hosted and much more customizable.
Ademis Feedback let the users of your application explain their issues directly in the website: a small button is added in a corner of the website, the user can click on it to describe its problem and send a report to a specific URL.
Ademis Feedback also support screenshots and screenshots editing by the user so s/he can explains in a visual way what bother them.
Each report sent by Ademis Feedback also includes the context of execution of the user: what browser s/he uses, what plugins are installed, what is the HTML when the problem occured, etc.
The options of the library let you customize everything: you can choose how and where to send the reports, how the button should look, whether the users can edit their screenshots or not, etc.
Default theme icons are the Material icons from Google: https://www.google.com/design/icons/.