µTorrent is an efficient and feature rich BitTorrent client for Windows sporting a very small footprint. It was designed to use as little CPU, memory and space as possible while offering all the functionality expected from advanced clients.
Feature list:
- Smart bandwidth usage
- File level priorities
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Configurable bandwidth scheduling
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Global and per-torrent speed limiting
- Quickly resumes interrupted transfers
- UPnP support (WinXP only)
- Supports popular protocol extensions
- Typical memory usage less than 6 MB
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Incredibly small: 115 KB
Download: 
Screenshot: 
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Changelog:
- Feature: UNICODE!
- Feature: Added option to enable/disable internal tracker.
- Feature: Detect encoding field in a torrent and parse filenames accordingly.
- Feature: Support crashdumps on pre-WinXp.
- Feature: Added option to sort downloads based on the label.
- Feature: Autodetect if the language textfile is utf8 or ansi.
- Feature: Rate limit DHT traffic.
- Feature: Nicer availability graph.
- Feature: Added setting to control how fast utorrent tries to connect to new peers.
- Change: Increase the amount of connects a bit.
- Fix: Error message in tray would sometimes not go away
- Fix: Don't count a seed as a download if there are free seed slots (#68)
- Fix: Change random port selection
- Fix: Upload a little bit more aggressively
- Fix: ulslots wasn't saved properly on restart.
- Fix: Support piecesize 16k.
- Fix: Use atomic movefile when saving resume file on XP
- Fix: Better utorrent.exe.log if translation loading fails
- Fix: Fix bug that DHT got stuck in (Login)
- Fix: Fixed some crash bugs. (Thanks to the crash dumps)
- Fix: Hopefully worked around the file open crash. (Caused by Adobe Acrobat 7).
- Fix: Fix crash bug if an invalid filename is selected in the opendialog.
- Fix: Fix crash when removing torrents.
- Fix: Fix sorting in pieces tab
