Redmine

This plugin sends email digests. A digest is a summary of a project's activity over a period of time. Each project is checked for activity during the specified period of time, and if there is new activity, an email is sent to each user who has opted to receive the digest.

This plugin may be called by a scheduler (cronjob, Windows task, rufus-scheduler, etc.) or run manually from the plugin's configuration page.

The number of days summarized and the start date of the summary are configured by the site administrator. In conjunction with a scheduler, this will send a daily digest, a weekly digest, etc.

A scheduler of some kind is needed to call the digest automatically (although a means is provided to create the digests manually).

The readme provides some examples for various scheduler command lines (cron job, Windows task, or rufus-scheduler).

After the plugin is installed, the readme is available from the plugin's configuration page (Administration > Plugins > Digest > Configure > Readme).

Improvement patches are definitely welcome.