WordPress sites use plugins to add functionality not covered by core WordPress. There is a huge range of plugins and I use the free versions hosted on wordpress.org.
Plugins visible to site editors
- Genesis Blocks: Used to make the list of pages with galleries look better
- TablePress: For prettier display of tables such as programme, committee members
- Volunteer Signup Sheets: Used by a few sites to implement event signup sheets
- Very Simple Contact Form: The Contact Us form
- Very Simple Event List: Your events listing
- WP Featherlight: Lightbox for viewing pictures in a gallery
- WP Statistics: Gathers visitor statistics
Plugins which work in the background
- Members: Used by me to limit how much (damage) site editors can do
- ShortPixel image optimiser: reduces the size of image files.
- Wordfence Security: protection against potential attackers
- WP Mail SMTP: Reliable emailing from the site (e.g. from the contact form)
There is one plugin which is not in the WordPress repository, which is one I use on all my sites to add few common features such as Google Map embeds, obfuscation of email addresses, icon embeds, etc. It can be downloaded and installed manually from here.