One of these applications is Ardour. You can install 2009's version 2.8 from the official Ubuntu repos. The newest version is available for free as source code or in a limited demo binary from the Ardour webpage. You can also get an unlimited binary paying a small amount. But I wanted to test the newest version without limitations before contributing to the project.
I'm considering these webcams to use them with the RGBDtoolkit. I wanted to know their field of view, and if they would match the Kinect wide angle lens. In the technical specifications of the c910 and the c920, Logitech provides only the diagonal FOV, but does not say if that data refers to a 16:9 or to a 4:3 aspect ratio. Most common sensors are 4:3, and judging by the capture frame sizes, so are these too.
I finally got a wide angle lens that let me match the FOV (Field Of View) of the Kinect, a Canon EF-S 10-22mm f/3.5-4.5 USM, borowed from the Fine Arts College facilities where I work, in the Universitat Politécnica de Valencia.
I made a small application as a proof of concept towards an automated Kinect - DSLR calibration process, and also for a possible further automated recording-download system controlling remotelly the DSLR via USB.
There is an interesting tool to improve the use of Kinect's mesh look in audiovisual projects called RGBDtoolkit. With it you can calibrate and record your DSLR's footage together with the depth data, and later use both to generate a 3D textured mesh of the scene from any point of view.