aria2 is a well-known, long-established, feature-rich and powerful universal file downloader that is very popular among programmers. However, its command line operation mode and overly complicated installation and configuration process make it difficult to popularize among normal users. So a series of GUI front-ends for aria2 were derived, and Persepolis Download Manager is one of the best. It saves users the trouble of configuring aria2 and using the command line to download files, and simplifies the operations.