WikiEducator can be a great personal learning environment. The resources here are personal (libre) learning resources developed while I try to learn things, usually too many things with too little time.
While the following may not be useful as complete courses or modules for anyone, there may be a few small gems and you are free to use anything you find here as the basis for better libre learning resources. Comments and guidance are welcome.
Always wanted to learn touch typing. On Ubuntu (or any gnu/linux distro) install and try: