Skylog is a flight logging software for private pilots (I do not know to what extent requirements of commercial pilots are met). Skylog is quasi the electronic replacement of the well known JAR FCL log:
manages multiple flight logs for different pilots
preferences for different pilots
intelligent guesses for most of the data upon entering a new flight
manages the pilots and their attendants
manages aircraft
imports airfields out of csv files, the format is compatible with FluPP
imports a flights from the Android flight time logger
automatically computes statistics
Additional features are supplied by various plug-ins.