- Caching (Redis)
- SEO (Rank Math, else sometimes Genesis or I create custom fields)
- E-mail delivery API (SparkPost, Mailgun, SendGrid, SES, etc.)
- Forms (usually Gravity Forms Elite, else Forminator if they have more basic needs)
- Utilities (Better Search Replace, Regenerate Thumbnails, Safe SVG, etc…)
Many of my Guten-free clients use some sort of page builder (or advanced editor) as well, but I didn’t include that because it varies greatly by client/site. Security is present in various forms, but that also varies greatly by setup and site.
I am fortunate that none of my clients give a damn about the GDPR. I always ask them about it, though!