Apps with 'Mirror search' feature
Multiple folks on Reddit report adware, sandbox'd myself and got multiple viruses and adware in installation, even attempting to label as "not-a-virus;" -- has very malicious bundles. Would recommend tagging as such due to the installer's crap.
The installer prompts you to change your default search provider and install a media player. After installation it opens a webpage with an ad for another software install.
BitComet is a BitTorrent/HTTP/FTP download client with support for modern BitTorrent features, long-term seeding, intelligent disk cache and video preview of downloaded files.
iGetter is a full featured download manager and accelerator. It resumes broken downloads and recovers from download errors.
KGet is a versatile and user-friendly download manager for KDE. By default it is the download manager used for Konqueror, but can also be used with Mozilla Firefox.
Progressive Downloader is a free download manager for your Mac that supports multi-thread downloading and mirror search.