The Services page at the status menu shows information on running or stopped services of your IPFire installation.
Shown are the names of the services, their corresponding PIDs (when running) and the amount of memory they use.
The second part shows installed add-ons in a similar manner plus they can be started, stopped and set for starting at boot time from here.
By (un)checking a service in the column boot the service is set whether to start at boot time or not. By clicking on the green up arrow the respective add-on service will be started whereas by clicking on the red down arrow it will be stopped.
The processes diagram shows the history of started services. Some services, like "Java" in this example, may use considerable amounts of resources so other processes might not be visible at all.
The process memory diagram shows the memory usage of those services in a similar manner.