Lattice is a Java build system with strong multi-module support. Build files are written not in XML, but in the Python language. The benefits are much better readability and powerful imperative build scripting. For multi-module projects, Lattice uses topological sorting to decide the correct order to build each module. Because a custom task is just a regular Python function, they can perform any type of work, including invoking other Java build systems such as Ant, Maven, or Ivy.
Upmf is a source-based package manager written almost completely in Scheme. The user is able to search, build, and remove packages. Since Scheme through GUILE is very extensible, the user can customize the procedures, or even exchange them with his own, if wanted. Packages are stored in their own self-contained directories and are incorporated into the filesystem with help of GNU Stow.