SmartView Tracker is the legacy log viewer that only works with one log file at a time.
It still exists in R80 releases, but it is considered legacy and not being updated.
SmartLog is the new log viewer that works with indexed logs.
It allows for searches across all log files.
In R80+, it is the default log viewer integrated into SmartConsole.
The future of "SmartLog" is actually SmartView, which is web-based and saw a significant improvement in R80.20.M1.
SmartView Monitor is about monitoring specific Check Point components, as Vladimir said above.