https://npmjs.org/package/n || https://github.com/visionmedia/n
312 downloads in the last day
2 269 downloads in the last week
16 724 downloads in the last month
https://npmjs.org/package/nvm this stats aren't fair to compare with 'n', read above
30 downloads in the last day
150 downloads in the last week
691 downloads in the last month
https://npmjs.org/package/nodist
1 downloads in the last day
33 downloads in the last week
79 downloads in the last month
attention with 'nvm', because the repository linked in the npm registry is https://github.com/brianloveswords/nvm but there aren't any updates long time, it's a fork from https://github.com/creationix/nvm and there the development takes place !!
If you compare creationix/nvm with visionmedia/n on github, the winner is creationix/nvm
... but I'm using 'n' ;-) but this isn't really a recommendation, because don't need it all the time and never checked if 'n' is better than 'nvm' or vice versa.
Now I can recommend https://github.com/creationix/nvm
"n" works fine on my OSX, but it installs binary files, nvm compiles nodejs, that works better on i.e. Linux etc.... "n" failed ;-)