The Akimbo made by Rock Exotica was a long-awaited mechanical climbing device that went up for sale early in 2019. The device is compact and light weighing only 9.2oz. It allows a climber to ascend and descend on both stationary rope (SRT) and moving rope systems (MRT or DRT).
The Akimbo is midline attachable and adjustable without the need for tools. The device costs $350 and you can pick one up here.
The SAKA (Self Ascending Knee Ascender) mini-MAX started selling around June of 2019 after the first version of the SAKA was discontinued due to legal issues. Fortunately, many climbers say that the second version is even better.
This device allows users to simply walk up the rope for easy ascension into the tree. It uses the same ascender as the original SAKA and works on all common rope sizes from 9mm to 13mm. The SAKA mini-MAX only weighs 10oz and is small enough to fit into your pocket.
This device is currently only being sold at WesSpur Tree.
Petzl ZIGZAG and CHICANE
Rigging Rope Wrench
The Rigging Rope Wrench is a friction device that can be added to the top of the tree. This device is great for smaller crews because not only can the lowering rope be controlled from the ground, but it can be passed to the climber in the treetop if need be.
The Rigging Rope Wrench starts at $220 and you can pick one up at your favorite supplier.