About the acceleration effect for download speed of Internet Download Manager (IDM for short), I believe people who have used IDM can not leave it any more. Here, we do not need to introduce its features again.
The appearance of µTorrent (AKA: uTorrent) made all torrent file downloaders overshadow (especially the BitTorrent or BitComet which was popular for a long time), because it is much more lightweight, powerful, fast, clear and easy to use (written in C++). For now, it has been really worthy of the #1 and most popular torrent download client on desktop worldwide.
It was originally written in C++ by Christophe Dumez (from France) in 2006 when he was a student. Now it's maintained by worldwide volunteers on their spare time. qBittorrent is a free, open-source and cross-platform BitTorrent client (torrent file downloader) with nice UI based on Qt and built-in search engines.
Direct downloading the full Windows/Office ISO setup files (not the web installers) from Microsoft's official website is never an easy thing. That becomes harder especially for common computer users. The emergence of Windows and Office ISO Downloader (AKA: Windows ISO Downloader Tool) solved this problem perfectly!