Free Software for Wordpress
Simple URLs
Simple URLs is a complete free and open-source URL management plugin for WordPress that allows you create, manage, and track outbound links from your site by using custom post types and 301 redirects.
MainWP
The MainWP WordPress plugin is a free and open-source, self-hosted solution for managing multiple WordPress sites from a single dashboard. With MainWP you can manage posts and pages, controlling users, making backups and performing updates through the unified MainWP dashboard. All of which will minimize the time and cost of maintaining multiple WordPress sites.
WPdetector
WPDetector is a free web-based tool that detects all the plugins and the theme used by any WordPress website. With WPDetector you can easily find out what plugins and themes a WordPress-powered website is using. Simply enter the URL of the website that you want to scan and investigate and a detail report will come back in seconds. On top of that, the tool also provide additional information about the website and its domain.
WP Meta SEO
WP Meta SEO is a search engine optimization tool for WordPess-powered websites. The plugin gives you a full control over your WordPress website's SEO that can be managed from a dashboard within your WordPress admin panel. The dashboard provides metrics for permalink structure, meta titles, meta descriptions, ducplicate content , link title attributes, 404 error pages, and on-page data that can be used to improve your websites overall ranking. You can download the WP Meta SEO plugin for free from the WordPress plugin directory.
Openverse
Openverse is a platform for Creative Commons licensed digital works created by Automatic, the company behind WordPress. With Openverse you can browse through and download over 600 million artworks for reuse. Openverse is available as a web application and can also be accessed with a dedicated WordPress plugin.
Jetpack
Jetpack is the WordPress toolkit developed by Automatic, the developers of WordPress. The plugin provides security, performance, marketing and design tools for WordPress powered websites. Jetpack allows over 5 million WordPress users to monitor site changes, debug, troubleshoot and maintain a healthy and secure website.
Envira Gallery
Envira Gallery is a WordPress plugin that can be used to create a gallery for your Wordpress-powered website. With Envira Gallery you can showcase images to your visitors with ease. Envira Gallery is also avalible for the WordPress.com platform if you are signed up on a business plan.
All-in-One Video Gallery
All-in-One Video Gallery is a free video gallery for WordPress. With All-in-One Video Gallery users can add videos as posts on their WordPress-powered website. The plugin handles everything needed to build a scalable, searchable, SEO optimized video gallery or video sharing site.
InspectWP
InspectWP is a free web-based tool that detects all the plugins and the theme used by any WordPress website. Just enter the URL in the Input Field and InspectWP detects which WordPress plugins and theme the website is using. It also detects many other data, especially about WordPress Websites, like GDPR-Checks, Security-Checks, Hosting any many more.
Semrush SEO Writing Assistant
With Semrush SEO Writing Assistant you can do content optimization on the go based on your top 10 rivals in Google rankings. Semrush SEO Writing Assistant also allow you to get a quick overview of your content and provide with tools to make the text reader friendly and original. Semrush SEO Writing Assistant is available as a service part of SEMRush offerings and is also available as a WordPress plugin.