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I use Ares Galaxy since day one, it is also open source and written in Delphi - pascal language. I love so much Delphi. It's not perfect but it works fine for me.
Ares Galaxy current version:2.4.0 (18 Feb 2016)
Need a little bit more info, screenshot? Here: http://aresgalaxy.io/Ares is a free open source bittorent and chat program that enables users to share any digital file including images, audio, video, software, documents, etc. You may now easily publish your files through the Ares peer to peer network. As a member of the virtual community, you can search and download just about any file shared by other users. Latest versions also support internet radio stations. With Ares you can join chat rooms or host your channel and meet new friends.
Need a download link to try? Here: https://sourceforge.net/projects/aresga ... urce=accel
I stay away from these torrent client: Vuze, uTorrent, BitLord, FrostWire, Limewire (dead now) for various reasons I am not at liberty to explain here.
Is Ares can be portable: YES, stealth? The usual not so yes. What you might not know is any VCL compiled in Delphi are naturally portable and need NO runtime library or other DLL but what is in the OS targeted.
P.S.: I did a search inside the catalog here and did not find this torrent in any entry, can be a new submission but if already tested and non-approved. Otherwise it's posted and I really need new spectacles.
Have all a nice day.