Edge Cache Marker is a free Joomla 5 / 6 system plugin that sets a marker cookie on editor login so upstream edge caches — Cloudflare Cache Rules, SiteGround Dynamic Cache, Fastly, Bunny, Varnish, NGINX proxy_cache, any CDN with cookie inspection — can bypass cached HTML for authenticated editor sessions while still serving cached HTML at edge speed to everyone else. Public visitors get the ~30 ms edge-hit TTFB the cache is there to deliver; logged-in editors keep seeing every SP Page Builder edit pencil, Joomla inline pencil, module edit icon, and template edit icon in their overlay.
Cybersalt Articles Module Maxxed is a free Joomla 5 / 6 system plugin that adds a "Skip first N articles" setting to Joomla's core articles modules. Set Skip to 5 and the module shows articles 6 through 10 instead of starting at the most recent. Joomla doesn't have this setting built in, even though there are plenty of times you want it. The most common one is when you've got a list of articles at the top of a page and a module below that needs to pick up where the list left off.
Cybersalt SiteGround Cache is a free Joomla 5/6 system plugin that integrates with SiteGround’s server-side dynamic cache. It auto-purges SiteGround’s cache when your content changes, sets the right HTTP cache headers, and strips Joomla’s session cookie on cacheable anonymous responses so the SiteGround edge can actually cache them. Without that last piece, SiteGround returns 
MCP for J is a free Joomla 5 / 6 extension that turns your Joomla site into its own MCP server. No local Node or Python install. No subprocess to babysit. No third-party proxy. Drop the package on any Joomla install, hand Claude (Desktop, Code, or claude.ai) the resulting endpoint plus a Joomla API token, and Claude can manage the site directly — articles, menus, modules, users, custom fields, ACL, scheduled tasks, Schema.org/SEO, and more — plus a growing catalog of free and Pro add-ons that extend Claude's reach into specific third-party Joomla extensions (4SEO, RSTicketsPro, Akeeba Backup Core, Cybersalt Release Manager, and more being added).