Desowin

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Rockbox Utility
Free
Rockbox Utility: Upgrade Your Music Player
Windows
QTScrobbler (64-bit)
Free
Sync Portable Player History with Last.fm and Libre.fm
Windows
QTScrobbler (32-bit)
Free
Transfer play list from portable players and manage the tracks.
Windows
USBPcap
Free
USBPcap: Open-Source USB Traffic Sniffing Tool
Windows