dov4l allows you to query and set the capabilities of a video4linux2 device. You can also set several parameters, such as brightness and contrast. It is a command line program that is especially meant for setting up a video4linux2 device before it is used with a Webcam grabber like grabby.
Grabby retrieves images from a video4linux or video4linux2 compatible Webcam or TV card. It can send them to an FTP server, can write them to disk, supports JPG and PPM, can auto-tune contrast/brightness, and lots more. It has tons of special effects. It also can display the effects in real time in a window or stream the result to a Web browser.
Freeseer a video capture utility capable of capturing presentations or demos. It can capture USB, firewire, local desktop, and more. It captures video and audio and mixes them together to produce a video, thus enabling you to capture great presentations, demos, or training material easily.
Flixn Media Platform is a collection of Flash-based tools and backend utilities to facilitate the generation of rich Web media, and video in particular. It features components to enable recording from a webcam and/or microphone, uploading and transcoding of video, and feature-rich playback. The platform was designed for mass/virtual deployment.
AstroStack is an easy-to-use astronomical imaging and processing tool geared towards the use of inexpensive webcam CCDs. It provides a very tunable environment to produce the best quality images. It supports the following features: tunable webcam sampling; image stacking (averaging, additive etc.); pre and post-capture gamma (brightness) and contrast correction; dark-shot CCD calibration (subtractive); and an internal 16-bit grey-scale format for optimal resolution.