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I am a beginner to GIS software and currently I have been given a task to model a telecom network. Most of the solutions that I came across are proprietary.

I want to know which open source software can I use to show the connectivity between multiple fibers (FTTX network)?

I do not need a software to plan and design a network, I just have to make a replica of the network that I already have in KMLs.

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    pease elaborate a little more on that problem you encountered. also, what types of geometry do you have (polylines and/or points?), and what's your plans with them (e.g. how does your desired outcome look like?). recommendations on this would already be broad by nature, try clear things up a little more. in general, a common open source GIS stack uses QGIS to visualize and model by sight, often combined with a powerful PostgreSQL/PostGIS backend to store and efficiently spatially analyze your data...depending on your needs. – geozelot Jan 11 '18 at 8:23
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    Welcome to GIS SE. Often I have to point out the Tour admonition to ask "only one" question, but you haven't asked an actual question. Please Edit the question to contain your question, keeping in mind that soliciting a list of opinion-based suggestions or general discussion of best practices is forbidden here. – Vince Jan 11 '18 at 11:39
  • You can do a lot of vector network analysis with GRASS GIS, see grass.osgeo.org/grass74/manuals/… – markusN Jan 30 '18 at 21:37