Looking for an IT data mapping solution that integrates with SharePoint 2013.
Need to be able to capture information about IT systems, how they relate, how the data flows through each system. Must be able to dynamically generate diagrams on the fly.
As far as I am aware, there is nothing like this that Integrates to SharePoint. You would have to create something bespoke.
Indeed, I would not recommend that approach as I think that the level of complexity and size of data is likely to quickly outstrip anything that would be especially performant in SP. SP is already a complex set of data and adding further complexity is not wise in my experience.
SP lists are good for simple data. I've been starting to create a service catalogue for ourselves in SP but it will be a very simple list & even as I've been thinking about it, I've quickly realised that it might not be suitable for long. Also, I'm not planning to hold much in the way of data interfaces.
Instead, I would recommend a solution that is more focussed with a database and a web front end that could easily be integrated to the SP site or simply linked.
These kind of systems tend to get very complex as you begin to discover links between systems and unless your organisation is relatively small and simple, I think you will regret it.
If your system architecture is at all complex, you would be better off with a fully-fledged Enterprise Architecture tool. That would allow you to begin to correctly map the logic between systems and even to map systems to infrastructure.
In short, to use SP, keep it very simple (simplistic) and forget the diagrams for now as you would have to create a bespoke interface anyway. Consider a bespoke database with web front end that can be linked to your AD for authentication and authorisation the same as SP and simply linked to from SP. Or for a more complex architecture, investigate the use of an Enterprise Architecture tool.
UPDATE:
OK, so you need something simple to draw out the data. That is a bit easier. I'm still not aware of a dedicated web part but to be honest, I've not looked.
My approach would probably be to use a JavaScript "Graph" tool - note the phrase "graph" not to be confused with "chart". A chart is a pictorial view of (often numeric) data. A graph is a set of nodes and "edges" (I probably haven't explained that very well). Graphviz is the most famous of such tools but that is a command line tool. However, there are plenty of JavaScript tools that might be used.
SharePoint is delightfully easy to integrate with JavaScript (apart from the bizarre field names and hopelessly overcomplex data structures!) & even with my limited skills, I was able to knock up a Google map "view" that uses the data from a normal SharePoint list. With a bit of help from a JavaScript library of course.
You simply hide the normal View Web Part. The data is available to the web page still and you can feed it straight into a JavaScript library that will do the graphing for you.
Here are some free and none-free libraries in case you chose to go this route:
Free:
Not Free
Worth also noting that, in theory, you could do this with Visio. However, there are not many examples out there because it is so complex.