ALTER_EXTENSION (7)  - change the definition of an extension
BerkeleyDB (3pm)     - Perl extension for Berkeley DB version 2, 3, 4 or 5
bridge-utils-interfaces (5) - bridge-utils extensions for the interfaces (5) ...
Config::Extensions (3perl) - hash lookup of which core extensions were built.
CREATE_EXTENSION (7) - install an extension
Digest::SHA (3perl)  - Perl extension for SHA-1/224/256/384/512
DROP_EXTENSION (7)   - remove an extension
ExtUtils::Mksymlists (3perl) - write linker options files for dynamic extension
File::Copy::Recursive (3pm) - Perl extension for recursively copying files an...
File::Glob (3perl)   - Perl extension for BSD glob routine
File::Tail (3pm)     - Perl extension for reading from continuously updated f...
h2xs (1)             - convert .h C header files to Perl extensions
hosts_options (5)    - host access control language extensions
iptables-extensions (8) - list of extensions in the standard iptables distrib...
libsmbclient (7)     - An extension library for browsers and that can be used...
Linux::LVM (3pm)     - Perl extension for accessing Logical Volume Manager(LV...
Locale::Codes::LangExt (3perl) - standard codes for language extension identi...
Locale::Codes::LangFam (3perl) - standard codes for language extension identi...
Moose::Cookbook::Extending::Extension... (3pm) - Moose extension overview
Moose::Manual::MooseX (3pm) - Recommended Moose extensions
mysql_fix_extensions (1) - normalize table file name extensions
Net::DBus (3pm)      - Perl extension for the DBus message system
Net::IP (3pm)        - Perl extension for manipulating IPv4/IPv6 addresses
Net::SSLeay (3pm)    - Perl extension for using OpenSSL
pagecache_isize_extended (9) - update pagecache after extension of i_size
phpize (1)           - prepare a PHP extension for compiling
phpize5 (1)          - prepare a PHP extension for compiling
pybuild (1)          - invokes various build systems for requested Python ver...
revoutput (3am)      - Reverse output strings sample extension
revtwoway (3am)      - Reverse strings sample two-way processor extension
shtool-arx (1)       - GNU shtool ar(1) extensional command
shtool-echo (1)      - GNU shtool echo(1) extensional command
Test::Warn (3pm)     - Perl extension to test methods for warnings
threads::shared (3perl) - Perl extension for sharing data structures between ...
UUID (3pm)           - Perl extension for using UUID interfaces as defined in...
version (3perl)      - Perl extension for Version Objects
version::Internals (3perl) - Perl extension for Version Objects
X11::Protocol::Ext::BIG_REQUESTS (3pm) - Perl module for the X11 protocol Big...
X11::Protocol::Ext::DPMS (3pm) - Perl module for the X11 Protocol DPMS Extension
X11::Protocol::Ext::RENDER (3pm) - Perl module for the X Rendering Extension
X11::Protocol::Ext::SHAPE (3pm) - Perl module for the X11 Protocol Nonrectang...
X11::Protocol::Ext::XC_MISC (3pm) - Perl module for the X11 Protocol XC-MISC ...
X11::Protocol::Ext::XFree86_Misc (3pm) - Perl module for the XFree86 Misc Ext...
x509v3_config (5ssl) - X509 V3 certificate extension configuration format
xrandr (1)           - primitive command line interface to RandR extension
xvinfo (1)           - Print out X-Video extension adaptor information
zforce (1)           - force a '.gz' extension on all gzip files