Man pages matching name stunnel4 in section 8:

stunnel4.8.en	debian 10 / stunnel4
stunnel4.8.pl	debian 10 / stunnel4
stunnel4.8.en	debian 11 / stunnel4
stunnel4.8.pl	debian 11 / stunnel4
stunnel4.8.en	debian 12 / stunnel4
stunnel4.8.pl	debian 12 / stunnel4