While CyanogenMod is generally regarded as the biggest and best of the innumerable custom ROMs, some of the others tend to implement interesting additions to Android much sooner. The latest nightly builds of CM 11 (Android 4.4) have added something that's not exactly new, but should be very much appreciated by immigrants from other ROMs. Users can now long-press the physical or virtual Recents button to quickly open the last app "under" the current one.
There are a lot of apps like SwipePad, and no matter how many we cover, I keep coming back to the original. Loopr is the first app in a while that's tempted me away, thanks to both an impressive visual presentation and some thoughtful features. At its heart Loopr is a a quick app launcher/switcher with the usual side-swiping mechanism, this time launched as a semicircle of icons similar to Circle Launcher Widget.