CamTimer is a free and open-source camera timer app developed by Dozing Cat Software for Android devices. It is a simple and efficient app that allows you to take pictures with a delay of 5, 15, or 30 seconds. Once you set the delay and press the shutter button, you will hear beeps at 3 seconds remaining, and then the picture will be saved. The app also allows you to take pictures without any delay.

In addition to the timer, CamTimer offers other features such as taking 4 pictures in succession, controlling the camera flash setting, and switching to the front-facing camera if available (requires Android 2.3 or later). After taking a picture, it is shown full screen, and you can easily share or delete it.