A couple of things I can think of off the type of my head that as spawned from the JB community is the notification center and wifi sync.
I agree.
Also installer came before the Appstore back in the 1.0 days of the original iphones.
Also copy/paste, icloud, wifisync, internet sharing/tethering and many other things that JB iphones had available way before Apple decided to implement them to their next iOS release.
Here's some more examples.
■Camera volume button snap – FastSnap, SnapTap, CameraButtons
■Camera editing enhancements – Snapture
■Access camera from lockscreen – Snappy
■Photo albums in Photo – PhotoAlbums+
■Private browsing in Safari – Covert
■Wi-Fi sync with iTunes – Wi-Fi Sync
■Use while syncing with iTunes – Synchronicity, FreeSync
■Enhancements to Mail – Mail Enhancer
■Rich text in Mail – Rich Text
■Mark multiple emails as read – Mark Read
■Delete individual calls – Call Delete, MobileLog
■Text shortcuts – Xpandr
■New gestures – Activator
■Custom vibrations - Vibrafications, MyProfiles
■Dictionary – “Define” Action Menu Plugin
■Tone Store – AnyRing, ToneFXs
■Emoji – Vmoji
■Stream HD Youtube content – My3G
■FaceTime over 3G – My3G, FaceBreak
■Contact pictures integrated in message display – ChatPic
So before some of you hate and talk down towards the JB scene realize that if Jailbreaking didnt exist you probably wouldnt have many of the stock features you have available now on your iOS device.