[Xperia Z Android Development] SonyMan7:
I don't know if anyone has already answered you but I am going to give you my xposed modules I have enabled over the already included and I find useful.

1. ActivityForceNewTask (sometimes opening a program within an app doesn't expand them into two different apps into the recents menu. Therefore making it difficult to multi-task. This module expands every different app into it's own in recents menu as it should be by default. A new alternative for this is the Fast App Switcher mini app if you use them but I always believe having it integrated it's better)

2. All notifications expanded (as it says all notifications are expanded by default. Standard action is only the first notification is expanded and the rest needs to be expanded by dragging them. I use this since I listen to a lot of music on the Z and I am getting really irritated when e.g the quick Walkman control in notification panel gets small if other notifications come as a result of hiding the previous track button and always needs to be expanded. Also in apps like Foursquare, swarm, twitter, flickr, etc quick actions are available when you expand like replying ASAP or follow, or share and liking photos, or even fav a friends check in just on the fly from notifications panel. All this are available on the expanded state of every app's notification. This module saves you time from expanding every notification one by one to see what's available)

3. Cputemp in statusbar (just for reference when I want to go underwater with the phone. Since high Temps in kit Kat and the back glass coming from the side of the camera lens a little bit off, I am getting water bubbles on the camera's lens everytime I go underwater and the temp is obove 60 Celsius degrees. So now I know not to or let the phone cool down before I do. Water comes of the lens as soon as you heat it up again by playing a game or leave it for a while to direct sunlight)

4. Cybershot Xposed ( for some camera tweaks as far as camera and buttons behaviour is concerned and hopefully the Cybershot feature enabled all the time. Haven't checked if it is but I can spot slightly better quality in low light photos with my unlocked bootloader. Works also with Google camera app, not only Sony's)

5. Jackos Xperia conversations tweaks ( make the sms app animations while composing and some other minor details just like Z2's.)

6. OK Google for 3rd party ( you are obviously already familiar with this)

7. ViewInPlay (enables you to go straight to a specific app's play store link either by long pressing on the app from the recents menu or by taping it with two fingers, since with one opens the actual app. It also has inside "settings/apps and in every app you chose, whether from Installed, Running or All apps tab, an extra button above the already existing "Force Close" and "Uninstall/Disable" buttons, with the function and name "View in Play". Useful for apps that play store won't list in "my apps" tab with the inconvenience of not knowing if they are up to date! And I am talking for apps that exist both in play store and our phones but play store insists on not "seeing" them to include them in my apps list)

8. "YouTube adaway" for YouTube ads

9. "Smartwatch 2 Watchface patch" (if you're using a Smartwatch)

10. Xperia FM w/o headset ( for places with good FM reception and your forgotten back home headset which won't let you even open the radio app, if you are using it. I personally don't use the last one but found it interesting enough to bring it up and list 10 in my opinion useful modules for our device)

Hope you check them and let us know how did you find them or propose new ones. Regards!