Progressive Downloader is a free download manager that supports multi-thread downloading and mirror search.

Key features:

• HTTP(S), FTP, FTPS and SFTP(SSH) protocols support.
• Auto-resume downloads. Any interrupted download will be automatically resumed when your system wakes up or the application relaunches.
• Multi-thread downloads. Application downloads different parts of the file at the same time to make the downloading process faster.
• Queue manager. Control the order of your downloads by changing download priority.
• Mirror search. Automatic search for different locations of the same file to take the fastest one.
• Smart drag and drop. Drag and drop a part of text with hyperlinks on the application badge to download them. You can also do a similar operation with any text or html file.
• FTP, FTPS and SFTP browser. Browse and download files with double click or using drag and drop.

Note: Progressive Downloader is free, but you can support the developer by buying the application from the Mac App Store.