In seeing where systemd is at today I ran GitStats on the systemd Git code to see how its development is pacing by the numbers. As of today, systemd consists of 1,434 files and is at 541,704. Systemd development spans 15,282 commits so far from 501 different authors.
Systemd is pacing to likely at least match last year's numbers of 3,792 Git commits. So far this year there have been 1,583 Git commits that added 165k lines of code while removing 127k lines of code.
While more than 500 individuals have contributed to systemd's code-base, the lead developers of systemd continue to be largely Lennart Poettering, Tom Gundersen, and Kay Sievers.
With continuing to add new features -- like DHCP client/server support -- the code-base for systemd is constantly getting bigger and is now nearly at 550k lines of code after breaking 500k lines of code just a few months ago.