Webmention Implementations

• Implementation Report Summary
• Implementation Reports

Libraries

Sending

• indieweb/mention-client-php - PHP library for sending webmention and pingpack notifications
• indieweb/webmention-client-ruby - Ruby library for sending webmention notifications
• phpish/webmention - Simple Webmention client (non-OO) in PHP packaged as a composer package
• vrypan/webmention-tools - Python client library and command line webmention sender
• pear2/Services_Linkback - PHP Pingback and Webmention client + server library
• bear/ronkyuu - Python client library and command-line tools
• glennjones/webmentions - Node.js a helper library for endpoint discovery, pulling validating Webmentions and sending Webmention requests
• willnorris.com/go/webmention - Go client library and command-line tool for discovering and sending Webmentions.
• webmentions-elixir - Elixir client library for sending Webmentions
• Pushl - Command line client in Python for automating site-wide webmentions using a subscription feed (RSS/Atom/h-feed) for discovery

Endpoint Discovery

• link_rel_parser - PHP http_rels($h) & head_http_rels($url) - HTTP header string parser for RFC5988 Link: rels (including X-Pingback) & function to curl a HEAD request and parse it all in one.
• jgarber623/webmention-endpoint-ruby - Ruby client library for discovering Webmention endpoints
• phpish/link_header - PHP Link header (RFC 5988) parser
• PEAR: HTTP2 - PHP Link header (RFC 5988) parser (documentation)
• ronkyuu - Python client library and command-line tools

Receiving

• PHP Minimum Viable Webmention handler: https://gist.github.com/adactio/6484118
• pear2/Services_Linkback - PHP Pingback and Webmention client + server library

Parsing

• microformats2 implementations and parsers
• went - Webmention Endpoint Tools, a Python library that takes source and target URLs and does the rest of the job for you.

Publishing Software

Some open source publishing software supports Webmention.

• Known personal publishing software sends webmentions and accepts webmention comments (including webmention updates), and likes
• FrancisCMS personal publishing software similarly sends and receives
• WWWTech personal publishing software similarly sends and receives
• phorkie sends and accepts webmentions to notify remote instances about forks

Some additional publishing software, portions of which are open source, supports webmentions:

• p3k sends and receives webmentions for all posts
• Taproot

Plugins

Plugins exist for some open source publishing software

• Wordpress
• Drupal
• Elgg
• Nucleus CMS
• Craft CMS
• Kirby
• ProcessWire

Tools

• Webmention Rocks! is a Webmention validator which helps you debug your webmention sending. It will provide detailed error messages to help you successfully send a Webmention, and will show your comment on the website when it's successfully processed.
• node-webmention-testpinger is a tool to ping your site with a variety of Webmention markup. Contains copies of a couple of real world examples of mentions that it enables you to ping locally to a development copy of your site.
• node-webmention-testendpoint is tool to test your Webmention client. Generates a demo-post and a demo-endpoint to test if your client parses the webmention-endpoint correctly and to check if the ping body is transmitted correctly.
• stapibas is a self-hosted service to send and receive Webmentions for websites and blogs. It can be used to send out Webmentions and Pingbacks for new posts on static sites.
• A Firefox Add-On which allows you to send Webmentions via a context menu

Services

• brid.gy is a service that sends Webmentions for comments/replies, likes, and reposts on Facebook, Twitter, Google+, and Instagram posts. It uses original post discovery to find target links for the Webmentions. GitHub repo here.
• Checkmention lets you test your Webmention implementation on your indieweb site, and whether it robustly detects certain types of XSS attacks. It also allows you to test for authorship spoofing.
• mention-tech is a service that can receive Webmentions on behalf of anyone via both Webmention directly, and a web form on its home page.
• webmention.herokuapp.com receives Webmentions for any registered page and allows them to be embedded through javascript.
• webmention.io is an open-source project and hosted service for receiving Webmentions and Pingbacks on behalf of your IndieWeb site.
• Telegraph is an open-source project and hosted service for sending Webmentions and Pingbacks.