Auxo provides great multitasking for older iOS versions.
Zephyr is great for intuitive gestures.
TetherMe lets you activate your iPhone's personal hotspot without adding a separate plan.
Both BiteSMS and Messages+ enhance iOS messaging.
SwipeSelection lets you select and edit text more easily.
apt.modmyi.com
apt.thebigboss.org/repofiles/cydia/
http://cydia.iphonecake.com
repo.hackyouriphone.org