CalendarSyncplus
                                This utility synchronizes Calendar entries between different calendar providers (Apps like Outlook,Services EWS/Google/Live).
                            
                        How to download and setup CalendarSyncplus
Open terminal and run command
                                            git clone https://github.com/Dashbrd/CalendarSyncplus.git
                                        
                                        git clone is used to create a copy or clone of CalendarSyncplus repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with CalendarSyncplus https://github.com/Dashbrd/CalendarSyncplus/archive/master.zip
Or simply clone CalendarSyncplus with SSH
                                            [email protected]:Dashbrd/CalendarSyncplus.git                                    
                                    If you have some problems with CalendarSyncplus
You may open issue on CalendarSyncplus support forum (system) here: https://github.com/Dashbrd/CalendarSyncplus/issuesSimilar to CalendarSyncplus repositories
Here you may see CalendarSyncplus alternatives and analogs
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