Launch Now is a Google Now shortcut replacement app which can be launched in the same way as the Google Now app. By swiping upwards from the home button or from the lockscreen you can launch the app and it will allow you to launch any app that you like. When launched the app prompts the user with a dialog containing customizable apps which can be launched. A possible use case scenario would be if you use Twitter alot you can put your favourite Twitter app in one of the slots and access it at any time by simply swiping up from the home button or the lockscreen. The app is very fast and fluid and is in active development so more is to come soon. I've attached a free test version with 2 app slots that you guys can try out. Enjoy!
Here's the play store link: https://play.google.com/store/apps/details?id=com.simon.LaunchNow
The youtube video shows the functionality pretty good:
Just so you know; you can still access Google Now with this app installed, just add it as one of the launch options.
If you have any questions or requests whatsoever I'll be sure to answer them here