Qatar Computing Research Institute (QCRI) has developed a free tool for screening papers for Systematic Reviews / Meta-Analyses: https://rayyan.qcri.org/welcome

From the description:

Rayyan is a 100% FREE web application to help systematic review authors perform their job in a quick, easy and enjoyable fashion. Authors create systematic reviews, collaborate on them, maintain them over time and get suggestions for article inclusion. (…) Rayyan also has a mobile app. With this app, you can screen your reviews on the go such as while you are riding the bus. You can even use the app while offline; once connected, the app will automatically sync back to the Rayyan servers!

Watch a quick tour: https://www.youtube.com/watch?v=irAOQgzFMs4&feature=youtu.be