The Slingshot Author app creates packages for Slingshot, letting other users quickly download a single package which installs a chart (or template) plus all the EAs and custom indicators used on that chart.
The Alert Forwarder adds email, SMS, Twitter, and push-notification alerts to MT5 EAs and indicators which do not offer this themselves. For example, if an EA or indicator generates an alert on screen then the Alert Forwarder can turn it into an email or a push notification.
EACopy simplifies the process of distributing new versions of .ex5 files across multiple instances of MT5. You simply put the new file(s) in one central place, and EACopy then transfers them into any number of different MT5 installations on your computer.