NotifEx

NotifEx gives you custom portal alerts for Ingress by processing the alerts in your notification bar.
The app does not interract with Niantic's servers.

NotifEx features:
+ setup and receive custom alerts (now you don't have to react on every attack, you get notified only for your favorite portals)
+ high priority alerts for critical portals; will ignore any notification or volume setting on your device - will you wake in the middle of the night to save that guardian badge portal? ;)
+ custom alerts channel you can share with your group so your friends can receive alerts when your portal is under attack and help you recharge
+ receive alerts while in game (you must have two devices on the same account or rely on others to forward your alerts)
+ Top Agent stats by number of attacks on portals in 1 day, 1 week and 1 month intervals. Who's portals are going down next? ;)

Note:
The portal list is generated dynamically. When an alert is first received the portal is added to the known portal list.
You can filter portals by name, country, city, address, or any keyword.
You can disable vibration and chose silent as the notification sound in Ingress but you must leave the notifications enabled if you wish to have them processed by NotifEx.
If your android version is less than 4.3 you can only use NotifEx to receive allerts broadcasted by other agents (NotifEx won't be able to process your notifications locally)