Features
This project has following features, which don’t exist in original traccar-web project:

following device
recording device trace
printing time stamps at device trace points (frequency is configured in Settings » Preferences) both for archive and recorded trace
‘show server log’ menu for viewing tracker-server.log file on Web
‘show wrapper.log’ menu for viewing wrapper.log file on Web
archive filtering
replaced ‘current state’ panel with popups. They appear either when you hover a row in ‘devices’ table or when you hover a marker on map
improved performance of positions loading when DB grows up
fixed issue when devices are not updated between different instances of web browser
moved DB transaction management and user rights checks outside of data service implementation (AOP) with google guice
possibility to detect ‘offline’ devices - when signal hasn’t came for some time (set up in device settings). They will be shown on a map with a marker of different colour and there will be some sign in popup that they are actually offline.
new device status - idle. It is shown in popup and also there will be a time of idling. Each device got new setting ‘Idle when speed is <=’, which is zero by default. It may be changed to some reasonable value, which is then used to consider device idle (for example to handle ‘satelite drift compansation’).
possibility to restrict ordinary users to manage (i.e. add/edit/delete) devices. Configured in global application settings.
save grid columns settings (sort order, column order, visibility, etc.) in the database
RESTful API. Available at /traccar/rest/{methodName} - allows to call methods from DataService class.
possibility to export archive to CSV and GPX
possibility to import archive from GPX
possibility to log in via GET request to a separate servlet (for example, for integration on external sites) - http://server-ip:8082/traccar/s/login?user=your_username&password=your_password
possibility to change password hashing function to store passwords in database passwords as hash sums instead of plain text
notifications via email/pushbullet
archive line and markers style customization
disable login dialog moving and resizing
prohibit empty device name and id
possibility to fit line of archived track the current map view
possibility to upload photo of device/vehicle
snap to roads
reports
commands
device groups
device filter/lookup
device visibility management
traccar manager support