Pathio is a new slicer for 3D Printing that is in beta (free now, will be paid once released). It is supported by, but independent of, E3D. The goal of Pathio appears to be to address shortcomings of other slicers available on the market and make certain advanced features easier to use.
A 3D Slicer is software that takes a 3D model and then separates it into layers so your 3D printer can lay down plastic to build up the full model by the end of the print. Some popular slicers include Cura (open source supported by Ultimaker), Slic3r (open source popularly known as what Prusa printers use), Simplify3D (paid), and KISSlicer (premium features are paid). With some rare exceptions you can use any slicer with any consumer 3D FDM/FFF printer. Prusa recommends Prusa Slic3r edition, but you can use Cura or Simplify3D just as easily.
I believe the more quality slicers we have to choose from the better for everyone. Because of the complexity involved with 3D models being sliced for printing I think there is always room for improvement when it comes to slicers. This makes me excited for Pathio because they aren’t just addressing user interface and ease of settings, but they are looking at how to slice smarter and better.
Their focus right now appears to be on generating gcode (what your printer reads to know how to operate for any given print) that produces prints with more consistent wall thickness, better corner reinforcement, easily applying different layer heights, infill, and other settings to multiple parts in a single print, and advanced scripting, all with close community feedback during development. Add in that they are supported by the leading hotend and nozzle manufacturer and I think this has potential for great advancements in slicing.
Keep in mind this is beta software with alpha features. If you are not yet comfortable with the slicer you’ve been using then I would wait, but if you’re an intermediate to advanced user who understands your current slicer settings this might be a great opportunity to try out and help improve a future product.