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I'm looking for an Open Source GIS application that supports Linear Referencing and Dynamic Segmentation for the development of a road inventory system. I already know about GRASS but I'd like to know if there are any other options.

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up vote 7 down vote accepted

The other option that I have found is using PostGIS. This software provides the spatial extensions for the PostgreSQL rdbms. These are both Open Source. There is a Linear Referencing Component described here: Link.

If you want to be able to access this functionality through a more full-featured GIS program, then you might use the Linear Referencing extension for Quantum GIS.

You may load the plugin for QGIS through the Plugin Menu. Use the Fetch Python Plugins command, then filter the search like the screenshot below:

enter image description here

Where the button currently shows "Reinstall", you will have the option to simply "Install" the plugin.

These are all open source products, and have active development, so I would say they are definitely worth checking out.

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Thank you for your help. I'm kind of surprised that there are so few open source options for LR & Dyn Seg. I would've thought it was a pretty important functionality to have. –  newbieGIS Jul 12 '12 at 8:15
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You have another one: LRS (to use in QGis 2.0 or upper). All the documentation of the plugin can be consulted here: http://blazek.github.io/lrs/release/help.0.3.0/index.html.

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