0install

Why

0install is used as cross-platform dependency resolver for not having to package the projects' releases for multiple package managers. This allows:

using the same toolchain for developing all kinds of projects (not only code)
on all operating systems.
version control.
distributing, depending on modules in any revision and not only a certain release. (Releasing/tagging revisions is optional for development but still useful for indicating stable versions.)
automatic backup of projects.
easy testing of modules locally without breaking the system due to multiple versions of a package.
developer interaction (world wide team work) without releasing because Git is the base system and 0install just used for releases.
easily fetching, inspecting the sources of a project in a certain version. (e.g. to debug or further develop / fork a local version, this can be rebased later on)
preventing dependency mess.
linear project history (not mandatory but possible) and all other Git powers.

Install a module / package:

   0install add <repository.uri>/<module>.xml

Depend on a module by using the 0install XML file URI of the corresponding module repository.