SLethe is a short name for the port of the Lethe patch to SLASH'EM. The patch is against SLASH'EM 0.0.7E7F2, a version which already contains parts of the Lethe patch. The name SLethe can also refer specifically the 0.0.7E7F2 playground at slashem.crash-override.net that uses this patch, or to the Rodney (bot) clone that reports deaths from this playground to IRC #slashem at Freenode.