Torrent related

Download using Citrio browser:
Select magnet link URL \ right click \ Download them all

Convert torrent to direct download link

filestream.me
+ downloadable and resumable using IDM (don't use https)
+ free account quota: 2.26GB
- partial download using IDM can't be previewed

bytebx
- very small file size limit for free account (100MB)

zbigz
+ downloadable and resumable using IDM (don't use https)
+  partial download using IDM can be previewed
how-to-download-torrent-with-idm-for-maximum-speed
Alternative zbigz or torrofic alternative

Download torrent via DropBox
Boxopus

Download partial/selected content
From info here it seems possible using utorrent or vuze

uTorrent: Cannot select individual files to download
Read post #9 and #10 from here
Also: Simple Tricks to Convert Magnet links into Torrent Files

Download without torrent client
www.bitlet.org
BUT still need to let Java app installed

Download Torrents on a Remote Server
* Remote Server is YOUR own server located remotely

Related
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Direct-link generator:
http://directshare.us/