Fresh is great. It lets you pull fragments of dot files from different repositories and combine then into contiguous files. So you could pull some bits from a team repository, have your own customizations on github (so you can share with others), and then have some private bits in a small private repo. Fresh well grab them all and combine then for you.

Fresh can also populate your $HOME/bin from various repos.

There is a directory[1] of reusable bits, though there are trust/security issues you might want to consider ...

[1]https://github.com/freshshell/fresh/wiki/Directory