GEM is very customisable in the facilities that you can turn on/off. You can also add an unlimited number of User Defined Fields; add your own Hierarchical Categories and Relationship Types. You can also change the behaviour of the system in many ways.

We do not have our own Report-Writer however. But since GEM uses MS SQL Server you can use its in-built report writer or any of the Report-Writer tools that work with it, like Crystal Reports, will be much more than adequate for the purpose.