If you want to get last news about GEMlib, please visit http://arnaud.bercegeay.free.fr/gemlib/
If you want to get details about last changes done in GEMlib, you can read the Changelog (from Dec 2002).
If you are interested in older changes that occured between GEMlib PL38 (last release before the MGEMlib branch of the library was created) and GEMlib 0.43.0 (merge back of MGEMlib and GEMlib), you can read
And last, the very first changelog, up to GEMlib PL38: Changelog.old
1.4.5-20051127