Total Automation, From Settings to SMS.
* Triggers: App, Time, Day, Location, Hard/Soft State, Event, Shortcut, Widget, Timer, Plugins 
* Actions: 200+ built-in, plugin support 
* Tasks: loops, variables, conditions 
* Scenes: design your own screen overlays 
* App Creation: create your own standalone apps to share or sell! (Android 2.3+)

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Changelog:

4.9u1
* mostly bugfixes
4.9
* added network access control per-app without root for Android 6.0+, otherwise all-apps 
* actions in File category: support for new external SD access API (Android 5.1+) 
* Android 7.0 bugfixes and additions 
* added Portuguese (Brazil) translation (many thanks to Breno Rafael Corrêa)
Many other additions, changes and bugfixes.
Details: http://tasker.dinglisch.net/changes.html