Alert Plus 4.0 for SharePoint 2013 & 2010 now comes equipped with Application Server support, which allows you to run list rollup from your application server to help offload work from your SharePoint web front end servers.
Also, Alert Plus contains several other new features, including the ability to CC and BCC users and groups on alerts.
Flexible email settings have also been added, such as the ability to use a custom “From,” additional lookups (tokens) for the Criteria Builder, support for sending alerts to AD groups, monthly alert schedules and image support in alerts.
To learn more, visit the Alert Plus product page.