Deffinatly You Cam 4 or Debut video capture software.
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Having experienced this problem myself, the best place to find replacement drivers and software for your logitech webcam is the logitech official website at www.logitech.com. Have a great day!
I recommend you a simple software which meets you basic needs. Webcam Capture Studio is a webcam recorder software, it simulates a virtual webcam, when you have a Skype chat just do some settings. You can Google it or cope the URL here, and then paste it in your address bar.
Your webcam should have come with it's own software. If it didn't, then follow the instructions that came with it. If you don't have them, then try searching the internet for that specific webcam..
Hardware
Kinda hard to make a suggestion without knowing what kind of webcam you have. Your best bet is google "free webcam software" and you will find several sites with free software (including free downloads from the webcam manufacturer). You can then refine your search for your particular application and download.
You cannot download a web cam. They must be purchased. You can download web cam software and device drivers usually from the manufacturer's web page or from a trusted site such as CNet.com.
I went with EyeSpyFX's webcam software. It's worked really well so far. I'm using WebcamXP webcam software, and it's been great.
The effects are provided by the software being used by the webcam. With the right software any webcam will produce special effects
The webcam on a Mac is controlled by the software using it. Launch Photobooth, Facetime, iChat, iMovie or any other software that requires the camera and it will be activated.
If you have a built in webcam to your computer you will probably have a software in it where you can take pictures and videos. If not I'm pretty sure you can buy a software.
hardware