I think it's worth asking, given the feedback you've provided so far, what are you after in a 3rd party deployment tool?
If you're looking for something that is free and that can be used immediately, then you'll struggle. The many, various software management tools out there typically require a license and some sort of agent on the endpoint.
If you're looking at free and immediate deployment, then I'd suggest:
GPO: http://www.symantec.com/docs/HOWTO81180
Or the inbuilt tools:
http://www.symantec.com/docs/TECH164308
http://www.symantec.com/docs/TECH183172
So, to circle back. What are your requirements in this 3rd party tool?
#EDIT#
Thumbs up to Brian who beat me to the GPO suggestion :)