Those that claim to be USB 1.1 compatible in their Specification listings may have utterly abysmal frame-rates on USB 1.x or show NO image at all, even though Apple's System Profiler may recognize the camera exists on the USB 1.1 bus.
Otherwise you're left dinking around with any of hundreds of old, discontinued webcams made for Windows and fiddling with Macam or IOXperts drivers hoping for a combination that will work.
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1394 is better than USB for video conferencing and chat in many technical aspects: External Fire Wire webcam compatibility with i Movie, less CPU overhead, higher frame-rates and avoids USB device contention slugging it out on a USB hub.
Native, driverless OS-level web cam support is now built into Mac OSX El Capitan, Yosemite, Mavericks, Lion, Leopard & Tiger, Windows 10, 7 and 8, Vista and XP Service Pack 2 or 3, and all modern Linux distros.
Here are three simple camera choices - all UVC compliant - from Logitech.
The external webcam models listed here are simply Plug and Play on modern Macs running Mac OS Sierra, OSX El Capitan, Yosemite, Mavericks, Lion, and Leopard. Make certain you have USB 2.0 speed or faster ports, OSX 10.5 , and a Mac faster than 1Ghz - then confidently choose one of these known working and Apple friendly driverless UVC webcam models listed below. Note: Logitech packages two different SKU's: The C922 model comes bundled with a mini-tripod, the C922X (x=without) model doesn't! Apple's UVC Kernel Extensions built into Mac OS Sierra, OSX El Capitan, Yosemitie, Mavericks, Lion and Leopard means any UVC based USB cam should just work when plugged into a USB 2.0 speed or faster port. Windows 7/8/10 and Linux also natively support UVC class video cameras.
UVC Compliant Cams For OSX #1 CHOICE : Mac Compatible HD Webcam With Mini-Tripod Like: Revised C92n-series optimized for live streaming: 1080p @ 30FPS and 720p @ 60FPS with H.264 video compression. #2 CHOICE : Premium Logitech C930e HD Webcam Incredible State-Of-The-Art Image Detail, Smooth Autofocus, H.264 Compression Like: Tripod Mount. These listed are ideal as an external webcam for an Apple Mac mini or Pro tower, and are also good Cross-Platform PC and Linux webcams for those who use VMWare Fusion, Parallels or Apple's Boot Camp on their Macs to run other operating systems.