[LINK] [OT] Recommendations for a tool to map an enterprise infrastructure?

[anthony.w.hornby at gmail.com]

Hi Everyone,
in our academic library our infrastructure is getting more and more complex.
This is driven by the need to provide increasingly seamless experiences for  
clients across all of university services online (and the library services  
are a key component of that).
However with a small administration team it is getting to the stage where  
we need to find better ways to visualise all the interactions that are  
happening to aid future planning and systems development, risk and impact  
assessment of changes etc.

So I really want to map out visually the technologies we use, their  
purpose, data flows between them etc and am looking for recommendations for  
a tool that will allow us to generate a high-level representation that can  
be drilled down into for the detail and:

1) Doesn't cost the earth. Hosted cloud-based stuff is fine. Open source /  
commercial is fine.
2) Has a reasonable balance between features and complexity - just  
recommend anything you think might be useful and we'll have to work this  
one out.
3) Has intuitive and context driven tools - eg you can change things  
directly in the interface from where you are in the map
4) Has good help and preferably a reasonable user community.
5) Something that scales as our central IT area is looking for the same  
sort of tool to map the university major systems as well, and it would be  
good to use the same tool.

All suggestions welcome !

Regards Anthony