Manual section 5

config - OpenSSL CONF library configuration files
jng - JPEG Network Graphics (JNG) sub-format
ldap.conf, .ldaprc - ldap configuration file
ldif - LDAP Data Interchange Format
mng - Multiple-image Network Graphics (MNG) format
pbm - portable bitmap file format
pgm - portable graymap file format
png - Portable Network Graphics (PNG) format
pnm - portable anymap file format
ppm - portable pixmap file format
slapd-bdb - BDB backend to slapd
slapd-dnssrv - DNS SRV referral backend to slapd
slapd-ldap - LDAP backend to slapd
slapd-ldbm - LDBM backend to slapd
slapd-meta - metadirectory backend
slapd-null - Null backend to slapd
slapd-passwd - /etc/passwd backend to slapd
slapd-perl - Perl backend to slapd
slapd-shell - Shell backend to slapd
slapd-sql - SQL backend to slapd
slapd-tcl - Tcl backend to slapd
slapd.access - access configuration for slapd, the stand-alone LDAP daemon
slapd.conf - configuration file for slapd, the stand-alone LDAP daemon
slapd.replog - slapd replication log format
ssh_config - OpenSSH SSH client configuration files
sshd_config - OpenSSH SSH daemon configuration file