You may get such softwares from Vorbis or on CNET online.
If you are using webcam for home and on Windows OS, then I suggest you can use free downloadable software:
Debut Video Capture Software
It captures videos with webcam, video recording device or screen storing directly on Hard disk, in file formats including .avi, .wmv, .flv, .asf .mpg, .3gp, .mp4, .mov and more.
You have to download another software BroadCam Video Broadcast Software to stream over the internet.