CASE tool wanted

[ddefend at mcdurb.urbana.gould.com]

I'm looking for a CASE tool which is written for xwindows or suntools,
preferably in public domain.  The type of tool desired is a general C
source code analysis tool which looks at the code statically as opposed to
a trace tool (things like "who calls/is called by this routine", "find all
occurrences of this C symbol", etc).  I'm looking for a tool which takes
advantage of the windowing capabilities of either of the two environments.

Any help is appreciated.  Please email responses or post if of general
interest.
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Dan Defend
Motorola Microcomputer Division
ARPA: ddefend at urbana.mcd.mot.com
UUCP: uunet!uiucdcs!mcdurb!ddefend