Something like: https://github.com/jacob-carlborg/orbit/wiki/Orbit-Package-Manager-for-D
I am aware of the Orbit project, but what Jigsaw will do for Java, and what similar built-in module versioning in other languages do, is to give control of pieces of large software systems. Having module version as part of the language will give tools like Orbit a nice, standardized way to know what is the module version of a D source file it is currently processing. Later on, it may help compilers create SO/DLL version information if a certain module becomes a library... Say you have a product, and you want to provide support for all legacy versions. One way to that is to put all old(er) versions of a module into a single library. If the module is not versioned, you would have to use external module information, typically stored in bunch of config files, and what is worse is quite often, if you lose these files, you have no idea what module version it was... (Unless you are pedantic, and write that information in the header comment of the module)
I use Maven a lot, every day, Jigsaw is not a replacement for Maven, it is a help to Maven, coming from the language itself.
