A video playlist of all our OSCON videos is available.
Our tools are all free and open source, licensed under a combination of the GPL and LGPL. (Our documentation, where appropriate, is Creative Commons licensed.) You can build the Transterpreter from source on Mac OS X and Linux. See the build instructions in our project wiki to get things going yourself. Not recommended for the casual user.
If you've got a question, post it to the appropriate mailing list and we'll help out and point you in the right direction.