Dinit

Which can (on Linux) also function as a system manager and init. It is:

• Portable — written in portable C++ code; compiles and runs on a variety of Unix-likes (Linux, various BSDs).
• Compact — with a reasonable feature set, but a sufficiently limited scope; designed to work with other system components, rather than replace them.
• Robust — written with a focus on being secure and correct.
• Usable — with simple configuration syntax and control commands.
• Well documented — check the extensive manual pages!
• Free and Open Source — distributed under the Apache License version 2.0