local function Wallhack()
    for k,v in pairs( ents.GetAll() ) do
        local Position = ( v:GetPos() + Vector( 0, 0, 80) ):ToScreen()
        if v:IsPlayer() then
            draw.DrawText( v:Name(), "MenuLarge", Position.x, Position.y, Color( 255, 0, 0, 255), TEXT_ALIGN_CENTER)
        elseif v:IsNPC() then
            draw.DrawText( v:GetClass(), "MenuLarge", Position.x, Position.y, Color( 255, 0, 0, 255), TEXT_ALIGN_CENTER)
        end
    end
end

hook.Add("HUDPaint", "walhax", Wallhack)