I have a point pattern (see below) in which I assume to find "significant" lines of points. However, I did not find any method that is integrated in a GIS or in R that searches for such line pattern in a spatial point pattern. There is one method that is implemented in the free software called PAST (http://folk.uio.no/ohammer/past) called point alignment.
the method is described in :
Hammer, Ø. (2009). New statistical methods for detecting point alignments. Computers & Geosciences, 35(3), 659-666.
beyond this method I am not aware of any tool that finds lines in point patterns. Any hints on possible tools, r-packages, etc. are most welcome.