iFrame Block lets you insert iframes in the block editor.

This plugin allows users to convert weight (Mass) from Metric to Imperial and vice versa. e.g. kilograms to pounds, kilograms to ounces etc.

User Logs plugin allows you to monitor user activity on your website. View user logins, logouts, comments and user registrations.

This plugin allows users to calculate their age from date of birth to current date. It can also be used to calculate age to a given date.

Time Zone Converter allows users to convert and compare time in different time zones.