Tixiao Shan has released a very interesting LIO-SAM (LiDAR Inertial Odometry via Smoothing and Mapping):
https://github.com/TixiaoShan/LIO-SAM

A demonstration video can be found here:
https://www.youtube.com/watch?v=A0H8CoORZJU

The algorithm relies on an external IMU and has so far been tested with a Velodyne 16 beam puck.
On the Github "ToDo" list it is stated:

Support Ouster lidar (hardware ready, no official Ouster driver yet, no ETA from Ouster)
Share Ouster lidar dataset

Does anybody know when the appropriate Ouster driver will be available?