hsh is a command-line driven user interface to your system with a full-screen curses interface instead of the scrolling terminal style output of traditional shells. The main purpose of hsh compared to a traditional shell is to make job output easier to work with. Each job's output is viewed and manipulated independently. This means, among other things, that you can incrementally create pipelines, and that a rampant process can't trash all the output of your session. Its syntax is designed for human use, not a programming language. It has a dynamic configurable interface, making useful information accessible.
LibCVS Perl simplifies the job of writing tools around CVS by providing Perl libraries that programmers can access directly in their code. Its current focus is libraries that use the cvsclient protocol to talk to a CVS server and are targetted at the development of client applications. Libraries that understand the RCS file format and provide fast server-side access are a future possibility.