The Xposed framework is a major boon to those of us who use an Android device that doesn't have a lot of support from the custom ROM community. It allows a lot of the things you want in custom ROMs - visual tweaks, interface changes, behavioral and button functions, fixes for annoying bugs, and a host of other things - via independent modules, with only root privileges. The latest beta release from developer "Rovo89" includes support for Android 4.4 and a bevy of performance improvements.
In an almost superhero-like act, Koushik Dutta (a.k.a. Koush of ROM Manager fame) has pushed his completely rewritten Superuser app to the Play Store just 15 days after first announcing it on Google+. This version introduces several improvements upon the original Superuser. In the last two weeks, the feature list has grown to include fully functioning multi-user support, secure PIN protection, and support for the x86 and ARM architectures.