I feel like it is time for me to do a top 10 list, so here it is. These are in my no specific order.
1. iCleaner Pro
iCleaner Pro allows you to free up that other space that shows up in iTunes. This allows you to download more apps or take more pictures than you normally would on the normal device.
Barrel is a tweak that allows animations when switching pages on your home screen. This makes a really cool add-on to have.
Activator allows you to set a specific motion to cause something to happen, for example when I shake my device it turns on the flashlight. It's is a very convenient tweet to have.
iFile allows you to explore the file system without connecting to a computer. This is helpful to add ringtones and change specific labels inside of settings.
f.lux changes the screen color to allow better viewing at night. It has been proven that using f.lux helps you sleep better than without.
6. Springtomize 3
Springtomize allows you to view and change advanced settings that Apple does not give you. This allows a higher level of device customization.
7. VirtualHome 8
VirtualHome is amazing. It allows you to use your home button to unlock your phone, enter multitasking(do other stuff also), and unlock it without actually pressing the button. This improves the life of the Touch ID button which is an expensive fix.
Zeppelin allows you to change the carrier name to anything you would like. Mine is a Clash of Clans logo.
CrashReporter records all crashes and provides a suspect about what could've cause it. This is helpful if your device crashes and goes into Safe Mode.
10. CyDelete 8
CyDelete allows you to delete apps that you had downloaded from Cydia without entering Cydia. You would deleted like you would delete a normal app from the app store. This saves time and effort going into Cydia, finding the one and removing it.