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Omnicutter

The *ultimate* cutting tool! You won't be needing any other cutter, laser, katana, sword or slicer after installing this mod. This is the most flexible, reliable, powerful cutting mod there is. It never misses and always slices anything perfectly no matter how fast you move your mouse! Have fun :)
The cutter also comes with a handy mini-physgun to move cut objects after you're done cutting!

Update #2:
As per @Doomdrvk's suggestion, I added a pause feature to the cut. You can now draw in 3d space any lines you want and the unpause to see the move and cut as they normally would. The button for this is "R".
You can also use this feature as creatively as you want ... you can paint cutting holes anywhere.

Small fix #1:
Things were floating if you grabbed something under them with the physgun. That should now be fixed!

CONTROLS:
"RMB" = "Right Mouse Button"
"LMB" = "Left Mouse Button"
"MMB" = "Middle Mouse Button"

Press "m" for slash options.
Press "h" to hide options menu.
Hold "LMB" to cut.
Hold "RMB" to grab and move dynamic objects with a physgun.
While holding "RMB", press "E" to throw the grabbed object forwards.
While holding "RMB", press "Q" to throw the grabbed object backwards.
Press "MMB" to cancel all cuts if it gets too laggy.
Press "R" to pause/unpause all cuts.