I just installed the ones white/azn posted and they work well, very easy to install. Heavier doors may require two of them.
I have not yet found an affordable or easy solution to retro-fitting soft-close drawers, if anybody does please share.
Also Ikea has these that are even easier and cheaper, simply clip in. Not sure if they are Ikea-specific though; they clipped into my hinges just fine but was not long enough: http://www.ikea.com/us/en/catalog/products/80126213/