deepnest.io - Pay what you want is awesome. And the core packing engine is awesome.
But it only lets you add one SVG at a time, via a GUI, so it’s painfully slow to load in large numbers of files to pack and cut, which is odd since the point of the engine is to speed workflow. There’s a change submitted in github to allow multi-file drag and drop, which would make it perfect. But until he accepts that change, it’s only useful for people packing fairly small numbers of files.