Tool to discover and document network and services

Hi all!

I'm looking for a tool (preferably free but ok if not) that can reduce my workload on a new project I'm working on.  I've inherited a new network with about 100 servers that was just abandoned by the old IT staff and have absolutely no documentation whatsoever about any of the machines on site.  

My current plan is to use the existing Nagios box's config to see what boxes/services are being monitored as well as an NMAP scan of the network and a whole lot of manual logging in to servers to document running services and configs. Basically starting from absolute scratch. As you can imagine, this is going to be heavily labor intensive, and I'm wondering what tools you guys might recommend to automate at least part of the process, perhaps automated device and service discovery with at least a partially clean output?

Also, what are your preferred tools for documenting networks like this other than manually creating Visio documents?

Thanks in advance for your ideas.
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If it is primarily a Microsoft based network I think you'd get some benefit by running the Microsoft Assessment and Planning Toolkit...
valheru_mAuthor Commented:
The network is kind of a mishmash as far as I can tell so far.  I would venture about 80% linux, some microsoft stuff, and I also would like to include the cisco equipment if possible.
Ernie BeekExpertCommented:
You might want to look at spiceworks, for me that works create with about 10 flavours of linux over here:

Also, have a look at this page (might be something you like there):
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valheru_mAuthor Commented:
Erniebeek - The links you provided seem to be for more monitoring rather than discovery and documentation.  

After some more research, the functionality I'm looking for is that of Netbrain or Lansurveyor, but without the 5 figure price tag.
Ernie BeekExpertCommented:
Well, spiceworks also does a nice job on the inventory (software/hardware).

But talking about lansurveyor, you just want to discover the network and create a graphical representation?
Try lansurveyor express:
If you already haven't ;)

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Lan Sweeper
valheru_mAuthor Commented:
Still trying out a few of your recommendations. Sorry for the delay, but wanted to let everyone know I haven't abandoned the question.
Ernie BeekExpertCommented:
Looking at the answers I would favor mine (seeing the asked functionality). But of course that is not quite objective :)
Some feedback from  valheru_m would be nice. Though I think spiceworks or lansurveyor would be what he is looking for.
valheru_mAuthor Commented:
I ended up using mostly spiceworks and some manual labor. Sorry for the delay in response. Things have been crazy busy.
Ernie BeekExpertCommented:
No problem, we just always like to know if we were able to help.
Thx for the points :)
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