PDFedit is a good choice:
I don't know if you have Gnome or KDE installed on your OpenSuse 11, and I don't know what kind of "resource constraints" you have ...
... but if you want a GUI desktop and GUI applications (like most people do), then I *definitely* encourage you to install *both* the Gnome and KDE runtimes in your working environment. Regardless of which desktop you actually use. This way, you can easily take advantage of just about ANY open source GUI application (including PDFedit, or just about anything else you can imagine).
The tradeoff, of course, is that you need decent CPU, disk and RAM.
If you want to run a Pentium 4 in 128MB RAM ... go ahead. But don't try to run a desktop and expect decent GUI performance too.
By the same token, if you want to install PDFedit (for example), and find that it brings in many MB of Qt dependencies ... that's *not* PDFedit to blame - *any* Qt app would do the same (if you didn't already happen to have the Qt runtime installed). PDFedit is essentially "free" - its the GUI runtime that introduces the heft.
IMHO .. PSM
There's also Open Office 3 (now an Oracle corporation - ugh!):