Apps with 'Download Queue' feature
iGetter is a full featured download manager and accelerator. It resumes broken downloads and recovers from download errors.
MigMigi is a sleek-looking stand-alone download manager with Chrome and Firefox browser integration, speed acceleration, download scheduling, download speed limits, and resuming.
Progressive Downloader is a free download manager for your Mac that supports multi-thread downloading and mirror search.
Take control of your JDownloader queue! View progress of your downloads. Start or stop them as necessary. Add links to hosted files and they'll be waiting for you at home.
µTorrent