High Quality Content by WIKIPEDIA articles! Olex and Olex2 are versatile software for crystallographic research. Olex (named by Neil Oxtoby) used to be a research project developed during PhD to implement topological (as connectivity) analysis of polymeric chemical structures and still is widely used around the world. Olex2 is an open source project with the C++ code portable to Windows, Mac and Linux. Although the projects share the common name they are not related at the source code level.