Rooster - is a handy tool that allows you to receive alerts from your favorite indicators:

• Supports up to 3 indicators, built-in and custom;
• Supports up to 4 different signals at the same time;
• Able to show pop-up alerts, send e-mail and push notifications.

This is version for metaTrader 4, version for metaTrader 5 is here. Detailed manual is attached in the Comments.

Default settings demonstrate MACD lines crossing signal.