Are the Stillwell plugins in Reaper the same as the ones you buy on this site? The ones in reaper may look different but do they sound the same?
Depends on the plugin, but for the most part you can figure that the JS plugins included in Reaper were early versions of the full VST/AU plugins we sell here. JS scripting is an awesomely easy way (for a programmer) to sketch out how a plugin might work.
The ones here look better, run better (more efficiently), and may sound better. It depends on the plugin, though…you be the judge.