used

Apache2::Resource (3pm) - Limit resources used by httpd children
aspseek-sql (5)      - the structure of SQL database tables used by ASPseek
autouse (3perl)      - postpone load of modules until a function is used
B::Asmdata (3perl)   - Autogenerated data about Perl ops, used to generate bytecode
B::Showlex (3perl)   - Show lexical variables used in functions or files
build.xml (5)        - configuration file used by ant to build projects
CGI::Util (3perl)    - Internal utilities used by CGI module
deallocvt (1)        - deallocate unused virtual terminals
Encode::CJKConstants (3perl) - - Internally used by Encode::??::ISO_2022_*
Encode::CN::HZ (3perl) - - internally used by Encode::CN
Encode::Config (3perl) - - internally used by Encode
Encode::JP::H2Z (3perl) - - internally used by Encode::JP::2022_JP*
Encode::JP::JIS7 (3perl) - - internally used by Encode::JP
Encode::KR::2022_KR (3perl) - - internally used by Encode::KR
ExtUtils::MM_Unix (3perl) - methods used by ExtUtils::MakeMaker
free (1)             - Display amount of free and used memory in the system
htpurge (1)          - remove unused odocuments from the database (general maintenance script)
in.identtestd (8)    - a small daemon that can be used to test Ident servers
inittab (5)          - format of the inittab file used by the sysv-compatible init process
ModPerl::BuildMM (3pm) - - A "subclass" of ModPerl::MM used for building mod_perl 2.0
Net::Cmd (3perl)     - Network Command class (as used by FTP, SMTP etc)
nmblookup (1)        - NetBIOS over TCP/IP client used to lookup NetBIOS names
popcon-largest-unused (8) - List size of unused packages
rcS (5)              - defaults used at boot time
revpath (1)          - generate a relative path that can be used to undo a change-directory
selinuxenabled (1)   - tool to be used within shell scripts to determine if selinux is enabled
setfsgid (2)         - set group identity used for file system checks
setfsuid (2)         - set user identity used for file system checks
SSL_CTX_set_session_id_context (3ssl) - set context within which session can be reused (server side only)
SSL_session_reused (3ssl) - query whether a reused session was negotiated during handshake
SSL_set_session (3ssl) - set a TLS/SSL session to be used during TLS/SSL connect
SSL_set_session_id_context (3ssl) - set context within which session can be reused (server side only)
Time::tm (3perl)     - internal object used by Time::gmtime and Time::localtime
Tk::Common (3pm)     - private class used by Drag&Drop
Tk::tkvars (3pm)     - Variables used or set by Tk
twfiles (5)          - overview of files used by Tripwire and file backup process