HW Virtual Serial Port allows creating virual serial port drivers.
GiliSoft International LLC
Protect your disc drives and your external storage devices by locking them.
USB AntiVirus International Inc.
USB Drive AntiVirus helps you find and remove the viruses from your USB drives.
HHD Software, Ltd.
It allows you to create virtual serial ports and emulate their behavior.
USB Virus Scan
A small utility that scans for threats in USB drives.
Libusb-win32 is a port of the USB library libusb to 32/64bit Windows.
COM Port Data Emulator is a tool for emulating a com port or an Ethernet device.
Wii U GCN USB Driver is a driver for the Wii U GCN USB adapter.
Barcode scanners can be connected to PC through serial port or USB port.
Advantech Equipment Corp.
A gang programmer, which works through your PC's USB port or parallel port.
Virtual Serial Port Driver allows creating virtual serial port pairs on a PC.
This free software monitors USB packets between USB driver and USB device.
REALTEK Semiconductor Corp.
USB card reader driver for Win XP/Vista/Win7 Driver (32/64 bits) Driver only (ZIP file).
AVerMedia TECHNOLOGIES, Inc.
AVerMedia H810 USB Hybrid DVB-T is a driver designed for AVerTV Pilot USB soft.
USB WebCam Driver as it name states is a driver designed for your webcam.