[xsace]

Dependency management (ie class/script/resource loading) is too coupled with the programming language execution environment.

It's not something you can make generic like a file/folder based version control tool. It's like asking for the Git of unit testing/continuous integration or whatever, not going to happen.

[talex5]

You can still build your language package manager on top of an existing one. For example, the ebox installer (for the E language) uses 0install to download metadata and package archives, cache things, solve version constraints, etc, but it takes care of actually wiring the language-level modules together:

http://0install.net/ebox.html

It needs to do this because each application is sandboxed. For most uses a generic packager is fine though. After all, most languages also have RPM, Deb, packages etc.