Ok, let's nip this one right in the bud:
Software "piracy" is copyright infringement. It's not theft.
"Stealing an application" is an absurd concept: unless you physically take the disk(s) that the sole copy of a piece of software is stored on, you can't "steal" software. You *can* copy it without authorization to do so, but that's not theft.
On a related note: hacking a device isn't at all illegal. Copyright infringement (at least in the US), is. The two have little to no relation to one another.
Oh, and to answer the OP: SBSettings if you like overly-fancy graphical software, or 'top' or 'ps' if you just want info on what's running.