Use your Android phone's camera as a wireless webcam in PC or Mac. Install needed drivers and use your phone with Skype, MSN Messenger etc video applications. It supports resolutions up to 4K. (Max resolution depends on the phone).
iVCam turns your Phone/Pad into an HD webcam for Windows PC, which has a much better quality than most webcams and is compatible with all webcam-enabled applications. Replace your USB webcam or integrated webcam now with your Phone/Pad!
SmartCam - Smart Phone Web Camera - Turns a camera phone (S60, WinMo6.x, Android, Samsung Bada) with bluetooth or WiFi into a handy webcam ready to use with your PC.This app doesn't have any features at the moment.Discontinued
The project is no longer developed since 2013. Last versions of the apps can be still downloaded from SourceForge.
SmartCam vs IP Webcam opinions
Webeecam is free Android USB camera app for connecting external USB WebCam to Android phones/tablets. This Android USB Web Camera app can display & record videos, images. Webeecam supports cameras that conform to UVC standard.
Transforms your Android device in a wireless IP camera. It works with both the Wi-Fi and the mobile data connection and can stream video from any cameras together with the audio.
Stream camera and microphone from your phone to your browser or vlc (HTTP or/and RTSP server). It also enables you to do some other interesting things.