Open Source
WP-CLI Base Command
A base class to ease working with WP-CLI on large imports.
https://jaimemartinez.nl/open-source/wp-cli-base-command/
Blogpost prefixer
Prefix only your post url and not your tag and category permalinks. More information about prefixing your blog posts
https://github.com/jmslbam/wp-post-url-prefixer
WP-CLI WooCommerce bulk edit
WP-CLI command to bulk edit Products (e.g. attributes and terms)
https://github.com/jmslbam/jm-woocommerce-bulk-edit
Distributor Meta data
Distributor add-on to push and replace related post_id‘s in meta data and Gutenberg blocks.
https://github.com/burovoordeboeg/distributor-meta-data
Clarkson Core (co-founded)
A plugin to write Object-Oriented code in combination with the Twig templating engine while keeping the WordPress Way of working in mind.
https://github.com/level-level/Clarkson-Core/
WP-CLI (contributed to)
WP-CLI is the command-line interface for WordPress. You can update plugins, configure multisite installations and much more, without using a web browser.