I can name a few...but be sure to watch videos or something on them SI you get a better idea of what they actually do
#1) biteSMS: (reply to or compose a text message from "anywhere" within any application, without having to open the Messages app. It comes with an ugly pink icon tho...you can change it to the stock Messages icon within the biteSMS settings. This tweak beats ALL messages tweaks. Meaning its better then ALL of them...I tried them all.lol.)
#2) IntelliScreenX: (just install it, play with the settings..it's awesome. It is the "only" tweak that allows CDMA iPhones to switch between 2G and 3G data. Can even use Notification Center on the lock screen)
#3) SwipeSelection: (can move the curser when typing by dragging your finger across the keyboard. Awesome)
#4) KBShortcuts: (seriously...watch a YouTube video on it..it's awesome)
#5) Activator (QuickDo is better, but Activator is needed to use many tweaks)
#6) Infinidock (scroll endlessly through dock icons, and set a custom number of icons to show in the dock on one page. Use Sprinftomize 2's cover flow effect to make your dock look like this:
Can also adjust the effect to your liking)
#7) CallBar: (when a incoming call comes in, instead of getting an "Answer/Decline" screen, a banner comes down, swipe right to answer, swipe left to end, press a volume button to mute, all while never having to fully stop what you are doing and leave the application you are in)
#8) iFile: (Access your iPhones entire file system rite on your device. Extremely useful and *every* jailbreaker should have it. With iFile installed you can download files rite from the Safari browser and open in iFile to view it. iFile also allows you to install deb files which are what Cydia packages are, compress files into zip files, unarchive basically any type of file, change UI images, like the lock screen slider for example..and so much more..the possibilities are "endless" with iFile)
#9) KuaiDial: (call any number from your contact by typing the name into the dial pad of the Phone.app with T9 functionality. It remember what numbers you call most often, therefore they can show up with less typing. It also has a blacklist feature where you can block any number for calls or SMS. The phone will show a misses call, but will never ring or appear to be having an incoming call)
#10) Caffiene 2: (quickly enable/disable the autolock feature via whatever feature you set it to via QuickDo or Activator. Very useful for when downloading large files like themes from Cydia)
#11) iCleaner: (make your device run slightly faster by cleaning out unneeded files that take up unnecessary space)
#12) MultiCleaner: (multitasking the way it should be. Assign any Activator/QuickDo gesture to "quit" the app your on, quit all apps at one Tim, or launch last app. Can also drag an app up and out of the app switcher to quit it.
#13) Activator: (assign any gesture, swipe, button press, to perform basically any action you want. The slide in gestures DO NOT work anymore tho..Developer refuses to fix them..this is why I use QuickDo also)
#14) QuickDo: (like activator assign any gesture screen tap, double tap, 2 finger tap/slide, 3 finger tap slide, tap and hold...awesome. And the slide gestures work perfectly. My personal suggestion...use slide up from screen right to activate the app switcher. That way you can just swipe up from the bottom right side of the screen to view the app switcher. Pretty nifty).