JSON::PP (3perl)     - JSON::XS compatible pure-Perl module.
Algorithm::Diff::XS (3pm) - Algorithm::Diff with XS core loop
B::Hooks::EndOfScope::XS (3pm) - Execute code after a scope finished compilat...
Capture::Tiny (3pm)  - Capture STDOUT and STDERR from Perl, XS or external pr...
Class::C3::XS (3pm)  - XS speedups for Class::C3
Class::Load::XS (3pm) - XS implementation of parts of Class::Load
Class::XSAccessor (3pm) - Generate fast XS accessors without runtime compilation
Class::XSAccessor::Array (3pm) - Generate fast XS accessors without runtime c...
Class::XSAccessor::Heavy (3pm) - Guts you don't care about
CPAN::Nox (3perl)    - Wrapper around CPAN.pm without using any XS module
crypto_akcipher_maxsize (9) - Get len for output buffer
Date::Calc::XS (3pm) - XS wrapper and C library plug-in for Date::Calc
DBI::PurePerl (3pm)  - - a DBI emulation using pure perl (no C/XS compilation...
Devel::Peek (3perl)  - A data debugging tool for the XS programmer
enc2xs (1)           - - Perl Encode Module Generator
ExtUtils::Constant (3perl) - generate XS code to import C header constants
ExtUtils::Constant::XS (3perl) - generate C code for XS modules' constants.
ExtUtils::ParseXS (3perl) - converts Perl XS code into C code
ExtUtils::ParseXS::Constants (3perl) - Initialization values for some globals
ExtUtils::ParseXS::Eval (3perl) - Clean package to evaluate code in
ExtUtils::ParseXS::Utilities (3perl) - Subroutines used with ExtUtils::ParseXS
ExtUtils::Typemaps (3perl) - Read/Write/Modify Perl/XS typemap files
ExtUtils::XSSymSet (3perl) - keep sets of symbol names palatable to the VMS l...
File::FcntlLock::XS (3pm) - File locking with fcntl(2)
h2xs (1)             - convert .h C header files to Perl extensions
JSON::backportPP (3pm) - JSON::XS compatible pure-Perl module.
JSON::XS (3pm)       - JSON serialising/deserialising, done correctly and fast
JSON::XS::Boolean (3pm) - dummy module providing JSON::XS::Boolean
json_xs (1p)         - JSON::XS commandline utility
List::Util::XS (3perl) - Indicate if List::Util was compiled with a C compiler
Mail::SpamAssassin::Plugin::Rule2XSBody (3pm) - speed up SpamAssassin by comp...
Math::BigInt::FastCalc (3perl) - Math::BigInt::Calc with some XS for more speed
Package::Stash::XS (3pm) - faster and more correct implementation of the Pack...
perlxs (1)           - XS language reference manual
perlxstut (1)        - Tutorial for writing XSUBs
perlxstypemap (1)    - Perl XS C/Perl type mapping
saxon-xslt (1)       - Apply a given style sheet to a given source XML document
spi_split_transfers_maxsize (9) - split spi transfers into multiple transfers...
Type::Tiny::XS (3pm) - provides an XS boost for some of Type::Tiny's built-in...
Type::Tiny::XS::Util (3pm) - support functions for Type::Tiny::XS
X11::Protocol::Connection::UNIXSocket (3pm) - Perl module for IO::Socket::UNI...
xmlto (1)            - apply an XSL stylesheet to an XML document
Xsession (5)         - initialize X session
Xsession.options (5) - configuration options for Xsession (5)
xset (1)             - user preference utility for X
xsetmode (1)         - set the mode for an X Input device
xsetpointer (1)      - set an X Input device as the main pointer
xsetroot (1)         - root window parameter setting utility for X
XSLoader (3perl)     - Dynamically load C libraries into Perl code
xsltproc (1)         - command line XSLT processor
xstdcmap (1)         - X standard colormap utility
xsubpp (1)           - compiler to convert Perl XS code into C code