Beyond some bug fixes, GeigerLog got various improvements for ease of handling and more flexibility for typical operations. Also, it can now create a count rate histogram with Poisson fit, which greatly helps to judge quality of logging. The theory behind it is explained in my Potty Training article (also on SourceForge)
It also offers a FFT analysis to inspect recordings for any periodic signal hidden within the data; I'll explain this separately.
It has first support for GMC-500 counters; Logging and History should work. However, the GMC-500 is modified in its configuration, hence certain counter control and readouts don't work, as the configuration is so far not disclosed.