Recently we picked up some sliders that are small enough to live on the tripod, but still offer a lot of options for smooth camera movement. The edelkrone SliiderOne.
Last fall we picked up a couple of DJI Osmo cameras. They've been incredibly handy for grabbing stable, handheld shots without a ton of gear. It's basically a drone camera on a gimbal that you hold in your hand. We find a use for it on just about every shoot these days, and after working with it for a few months I thought I'd share our findings.