I used to use Shavlik to deploy software patches to my computers (100 computers at multiple locations). It went away and I switched to go.vmware (VmWare Go Pro) at $12 per machine per year. Now it is being phased out. The new software they recommend is vCenter Protect Standard at $35 per computer per year.
I like having all software patches (not just Microsoft) deployable from one place.
What third party software do you use for deploying software updates instead of Windows Update?