PLUGINS4D has released Jet Fluids 3.0 beta, a FREE plugin for Cinema 4D R20 users. To use just download the zip file and unzip it into your plugins folder. It will then appear in a Jet Fluids menu at the top of Cinema 4D.
It is not recommended to use this plugin in production since it will be undergoing changes. Also be aware that the file format may change and any existing scenes may not load in future versions, but we will do our best to ensure they do.
Available for OSX and Windows for R20.
Note: This plugin is currently being developed to test out the Jet Framework. It will not be feature complete for quite some time and is only being worked on part time.
More info here.