My ~/.vim is under version control (Git) but not every plugin is available through Git. Some plugin developers use Mercurial, others use Subversion or whatever

My ~/.vim is under version control (Git) but not every plugin is available through Git. Some plugin developers use Mercurial, others use Subversion or whatever and most only provide a .tar, a .zip, a vimball or even a single vim script. This Git myopia is seriously getting on my nerve.