Flattr is described as 'Social micropayment service, that makes it easy for you to "flatter" things on the internet that you like. When you're registered to Flattr, you pay a small monthly fee of your own choosing' and is a very popular Money Transfer service in the business & commerce category. There are more than 50 alternatives to Flattr for a variety of platforms, including Web-based, Android, iPhone, iPad and SaaS apps. The best Flattr alternative is Liberapay, which is both free and Open Source. Other great apps like Flattr are Open Collective, Ko-fi, Steemit and Patreon.