These are a couple of nifty utilities that I whipped up over the years.
The first utility is hidelibr, which is a utility designed to hide arbitrary objects within libraries. The sourcecode is included in the zip.
The second utility is fastoff, which powers the calculator off so that it comes back on much quicker. There were reports that this utility drains batteries. I could never confirm this, but there was a mention by Joe Horn on comp.sys.hp48 that it happened. I don't recommend using this program unless you're sure you know what you are doing. The uncompiled sourcecode is included in the zip.