https://www.urltrends.com/link-to-us.html

http://www.ttdpatch.net/

http://www.weitz.de/regex-coach/

The Regex Coach is a graphical application for Windows which can be used to experiment with (Perl-compatible) regular expressions interactively.

http://sphinxsearch.com/

https://slack.com/

Where work* happens. *Whatever work means for you, Slack brings all the pieces and

http://www.hixie.ch/specs/pingback/pingback-1.0

http://phpxref.sourceforge.net/

PHPXref is a developer tool that's designed to ease the process of working on large PHP projects by making it very fast and easy to browse the code documentation along with the code itself.

http://phpformgen.sourceforge.net/

phpFormGenerator is an easy, online tool for creating reliable, efficient, and aesthetically pleasing web forms in a snap.

http://www.phpdoc.de/

http://gtk.php.net/