QA Tools allow you (the software product maintainer) to automatically generate regular releases and/or snapshots of your product. Your product can be distributed as a source code archive (typically .tar.gz) or as a binary distribution archive (.deb, .rpm, or .exe). It currently works with software packages that have source code managed using Subversion and that use autoconf/automake.
WWW::PkgFind watches Web sites, FTP sites, GIT repositories, etc. for new code releases, and downloads them. In other words, it's like a Web spider tuned for downloading software packages and patches. It is also able to generate a queue of incoming packages, to allow subsequent processing (such as running tests on them).
Cinabox (Continuous Integration in a Box) automates the setup of a Continuous Integration (CI) system by doing The Simplest Thing That Could Possibly Work. It consists of two simple scripts to set up a cruisecontrolrb CI server from scratch on an Ubuntu 8.04 system: one script to bootstrap Ruby, and another script to set up CI.