A history of OpenCAMLib
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OpenCAMLib & its closely related OpenVoronoi have been of interest to 
FreeCAD developers for use in computer-assisted manufacturing since 
its introduction in 2012. [1][2][3]

However, due to license incompatibility (FreeCAD is LGPL-2+, while
OpenCAMLib & OpenVoronoi were GPL3), these libraries could not be
distributed along with FreeCAD, which caused issues for users and
adoption into 2017. [4][5]

In July 2018, another FreeCAD user posted about using the libraries
which spurred the author to suggest relicensing them. [6] By the
beginning of August, the relicensing was complete. [7]

OpenCAMLib & OpenVoronoi provide unique and powerful functionality
for FreeCAD, and would surely find other uses if it were distributed
with Debian, but its development had been languishing somewhat due
to the licensing incompatibility issue. It is for this reason that 
the relicensing and a more community-focused maintenance approach 
has been undertaken.

[1] https://forum.freecadweb.org/viewtopic.php?t=3048
[2] https://forum.freecadweb.org/viewtopic.php?t=3051
[3] https://forum.freecadweb.org/viewtopic.php?t=5932
[4] https://forum.freecadweb.org/viewtopic.php?t=19205
[5] https://forum.freecadweb.org/viewtopic.php?t=23308
[6] https://forum.freecadweb.org/viewtopic.php?t=29763
[7] https://github.com/aewallin/opencamlib/issues/28