Node Version Manager
Node Version Manager is a tool for switching between releases of node. This is useful for testing your code before deployment, or testing your open source code against different versions of node. There have been API changes lately so it’s worth having a sanity check against major releases.
Installing a specific version works like this:
nvm install v0.1.91
nvm is actually a bash script, much like kiwi (by the same author). That means it should work on unix-like systems without too much trouble.
TJ Holowaychuk wrote a blog post with more details on nvm: Node Version Manager Preview.