Meld is a diff (diff means it compares) and merge (merge means it helps combine differences) for macOS + for Debian. Useful.

Varnish is an in-memory web site caching solution that'll speed up page load times and reduce server load. We use Varnish and implement it on our Packawhallop partner servers.

Macros -- short codes pulling data, including data from plugins and from custom fields -- can help web site content managers efficiently add and update content in WordPress.