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FindBugs looks for bugs in Java programs. It can detect a variety of common coding mistakes, including thread synchronization problems, misuse of API methods, etc. It is written in the GJ dialect of Java, and will run on any Java VM compatible with Sun's JDK 1.4.0 or later. It includes both GUI (Swing) and commandline frontends.
pycallgraph is a Python library that creates call graphs for Python programs.
Jlint will check your Java code and find bugs, inconsistencies and synchronization problems by doing data flow analysis on the code and building the lock graph. Jlint is fast, easy to learn, and requires no changes in the class files to be checked