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Chef has a deployment resource to deploy out of SVN or Git - it acts similar to what you're familiar with in Capistrano.
Because Chef's job is to control state of a node, it's actually an anti-pattern to use Capistrano for service control or deployments.
There are actually a number of cookbooks which have open pull requests to add OSX support to them. It's quite easy to add support yourself and contributing back to the project!