A few people have expressed interest in building an OpenROV. We'll be documenting our progress here.
At this stage, it's been mostly research. I've been reading up on OpenROV. I've purchased a BeagleBone Black from Lee's Electronics on Main St ($55 + tax). Being lazy, I downloaded the BBB image from the Github rep, unzipped it, and used Win32 Disk Imager to write the image to a microSD card (2gb are required, but I had an 8gb card laying around). Then I purchased a micro HDMI cable from The Source (around $10 I think), and took a quick peek at the BBB which runs linux. The default username is: rov and the password is: OpenROV. From there, I could browse to Start.html and see the interface used to control the ROV.
The point of all this was basically to get familiar with the BBB, and get a bit of insight into the project. I'll likely update the image again before it's done. Some other things to note:
Total Cost to Date: $65 cdn