Github has modules produced by
statianzo,
vim-scripts, and
digitaltoad.
None of the three are related by forking
And google finds this:
http://www.vim.org/scripts/script.php?script_id=3192
Which one is best?
Copying from below (vote those guys up if you find their info useful):
vim.org == vim-scripts – this is the original module
… after some edits and extensions (more syntax highlighting cases from what I can tell) the code evolves into …
digitaltoad – most popular
statianzo – similar looking features to digitaltoad, fewer followers
Right now, I’m going with the digitaltoad module.
The vim-scripts repos on GitHub are just git mirrors of the plugins on vim.org. It even says this in the README for that repo on GitHub, and points to the script on vim.org. That takes care of two of your links.
It appears the digitaltoad repo appears as though it was based on the package on vim.org at some point as some of the files attribute the maintainer to be the same person. That repo may have since diverged from the one on vim.org.
The stantianzo repo looks like it’s possibly a little different than either of the others.
My advice is to just try them out and use the one that you find works best for you.