Crowdsourced software testing is an emerging testing method which has drawn extensive attention in both industrial and academic community. This paper systematically summarizes the academic literatures and industry practice in recent years. This article first summarizes the related literatures from the perspectives of the research topics including software testing, crowdsourcing test process, experimental subjects and scale of crowdsourcing. It also compares total of 20 widely used crowdsourced software testing commercial platforms, and discusses their task domains, subjects, open call forms and performance evaluation forms. Finally, the paper presents the future trends, issues and opportunities for crowdsourced software testing.