System XVI is a modern take on service management. It aims to incorporate useful functionality while maintaining a modular design in the UNIX tradition.
System XVI uses kBuild (as used in VirtualBox, etc). There are minimal dependencies: you need procps and libkqueue in their development formats. Then just install your distro's package for kBuild (probably called kbuild) and run kmk.
System XVI is free software. You may use it and its source code under the terms of the GPL version 3.0 or (at your option) any later version. Please find a copy of the GPL version 3.0 included in doc/CPYRIGHT