Hey TTG!
Here is a list of a few POPULAR tweaks I know that WORKS on iOS 7,8,AND NOW iOS 9!
Maybe Thank the Topic to show some appreciation?

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Alkaline- Change your batter look (upper right battery bar)

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Barrel- Change the look of swiping through your home screens

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Bloard- Nice black keyboard that is easy on the eyes

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CustomLS- Change the text to swip to unlock

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TransparentVolume8- When turning up or down your volume, you can see through it

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Instahancer- Save instagram photos and zoom in on them in the instagram app.

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Clap- If you lose your phone, just clap and it makes a sound!

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Powertap- allows you to select, reboot, respiring, or safe when you hold don your power button to restart it.

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F.lux- Gives you the option to change the lighting on your phone from day to night. (Screen transitions by itself) This is good because when you wake up in the middle of the night and look at your phone, you can make it this nice halogen color that is easy on the eyes and doesn't make you squint at your screen.

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Flurry- Makes your sliders look more clear. (not all that interesting)

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Phantom- Breaks pretty much all the rules on snapchat. Allows to look at a snapchat as long as you want, upload pictures to snapchat and send striaght from your gallery!

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WinterBoard- Change the theme of your Jailbroken iPhone

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Zeppelin- Allows to put a little picture of almost anything in the upper left hand of your iPhone (By the connection bar)


NoSlowAnimation- NoSlowAnimation lets you feel the flow of water. It allows you to speed up the animations and transition effects


BytaFont 2-Bytafont 2 is a Cydia tweak which gives you a bundle of fonts for your device. You can change the default font on your iPhone/iPad.


Activator-Activator is one of the most amazing and wonderful tweaks ever as it allows you to customize a ton of shortcuts for almost anything. You get a bundle of options to launch your apps/settings etc. And most importantly, you can launch your apps anywhere with any gesture you want, e.g. on the home screen, lock screen or when you are on a running application and more.


Vine++-With Vine++ installed, you will be able to download Vine videos. But even more importantly, it turns off autoplay so if that feature annoys you, Vine++ can help you out there.


StopSend-StopSend is in beta and the developer (u/Sassoty) is working on adding more features and support. However, its a fantastic tweak that can save you from embarassingly bad messages caused due to autocorrect. Once installed, StopSend will disable the Send button when theres an autocorrect prompt is active. Basically, a simple way to prevent autocorrect fails.


Segue-Segue adds an amazing collection of photo slideshow transitions to the stock Photos app.


Sleekcode-Sleekcode (originally written for iOS 7 but works in iOS 8 although not officially tested) is a neat little tweak that lets you customize the passcode screen.


CroppingScreen-CroppinScreen is a Cydia tweak which lets you take a screen shot of selected area. When you press the home button and lock button together, you can drag your finger to select the area or part of the screen. And if you want to take a normal screen shot then simply press home button instead of selecting an area.

iOS 7+ Best Tweaks:

Assistant Unrestrictor- iOS features two voice assistants, one is Siri while the other one is less sophisticated but useful Voice Control. The Assistant Unrestrictor tweak enables iOS to switch from Siri to Voice Control when theres no Internet connectivity. Siri requires Internet to work while Voice Control works completely offline, which means you get a voice assistant regardless of Internets availability. It is a free tweak.


BatterySafe-The BatterySafe is a must have tweak for those who always run out of battery and only discover it when there device has turned off. With it installed the iPhone automatically turns off the services that use the most power, which includes WiFi, Bluetooth and brightness when the device is running low on charge. BatterySafe is a free tweak.


BitSMS- It allows users to instantly reply to text messages or initiate a call without leaving the current app they are in.


Bigify- With Bigify tweak users can make icons bigger or smaller, rotate them to their desired angle, change their opacity as well as remove their labels.


ByPass- ByPass makes having passcode protection less painful by allowing users to skip entering their password by performing an Activator action. Users can set a secret gesture that they can perform to ByPass passcode.


CCHide- CCHide is a Control Center tweak using which users can change the appearance of this section of iOS.


DockShift- DockShift is focused on changing the appearance of the dock. Using this tweak jailbreak users can simply remove the blurry background of iOS 7s dock.


Disable Parallax Effect- There is an accessibility option available but that also affects other animations.


FlipControlCenter- With this tweak you can add, remove and rearrange the switches in the top and bottom shelves of Control Center.


iCaught U- iCaught U tweak adds an awesome security feature to iOS devices that enables the device to take the picture from the front camera if someone enters the passcode wrong.


iTunes Radio Unlimited- iTunes Radio Unlimited tweak removes the skip limits from the iTunes Radio.


iCleaner- iCleaner is a jailbreak app that makes it easier for users to remove unnecessary files from their iPhone, iPad or iPod touch thus free up space for other stuff.


Messages Customizer- The Messages Customiser tweak from Cydia gives the messages app a unique personality. It allows users to cusomize the colors of bubbles for iMessaages and SMS messages.


RecordMyScreen- RecordMyScreen tweak provides an instant way for iOS users to record their on screen activity and share it with their friends.


Virtual Home- The Virtual Home tweak converts Touch ID into a home button allowing users to get to the homescreen simply by touching their home button and not pressing it.

CyDelete- CyDelete makes it easier to delete applications that were downloaded from Cydia.


NoPageDots7- Just like its name suggests NoPageDots7 tweak removes the page indicators from the homescreen.


How to Jailbreak iOS 9.3.3 (Semi Jailbreak, full is not out yet.)


Do at YOUR OWN RISK! I DO NOT TAKE ANY RESPONSIBILITIES FOR WHAT HAPPENS!

NEW iOS 9 Info!
Now because this jailbreak is new, there is not much we know that is compatible.

Compatible So Far:
-iFile
-Barrel
-Bio Project
-BytaFont
-Alkaline
-Bloard
-AppHide
-Auris
-Ayeris
-BlurryBadges
-SpotLock
-Igotya
-AdBlocker 2
-Safe Alarm 2+++
-Folderenhancer


Non-Compatible:
-f.lux
-Activator
-Forcy
-Springtomize
-TetherMe
-CCSettings
-Virtual Home

If I have any wrong or you find any i can update with let me know below!

How to Get Cydia on iOS 7:

How to Get Cydia on iOS 8:

Video of a few of these:

That is all i have for now but i will keep updating as soon a i find more cool ones that you guys may be interested in!