FindBugs uses static analysis to look for bugs in Java code. it can analyze programs compiled for any version of Java. Eclipse and Maven plugins are available. FindBugs has been downloaded more than 700,000 times.

FindBugs - Static Analysis Tool for Java

PMD is a source code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It supports Java, JavaScript, Salesforce.com Apex and Visualforce, PLSQL, Apache Velocity, XML, XSL.
 
Additionally it includes CPD, the copy-paste-detector. CPD finds duplicated code in Java, C, C++, C#, Groovy, PHP, Ruby, Fortran, JavaScript, PLSQL, Apache Velocity, Scala, Objective C, Matlab, Python, Go, Swift and Salesforce.com Apex and Visualforce.

PMD is a source code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It supports Java, JavaScript, Salesforce.com Apex and Visualforce, PLSQL, Apache Velocity, XML, XSL.

PMD - An extensible cross-language static code analyzer

Checkstyle is a tool to help programmers write Java code that adheres to a coding standard. Checkstyle is highly configurable and can be made to support almost any coding standard. Checkstyle provides checks that find class design problems, duplicate code, or bug patterns like double checked locking. This tool could be integrated as Ant task. Plugins are available for Eclipse, Netbeans, QALab, Emacs etc.

Checkstyle is a tool to help programmers write Java code that adheres to a coding standard. Checkstyle is highly configurable and can be made to support almost any coding standard. Checkstyle provides checks that find class design problems, duplicate code, or bug patterns like double checked locking. This tool could be integrated as Ant task.

Checkstyle - Checks Java coding standard

Catch common Java mistakes as compile-time errors

Error Prone - Catch common Java mistakes as compile-time errors

PyChecker is a tool for finding bugs in python source code. It is similar to lint. PyChecker checks for each function, class and method for possible problems. It is capable to identify import errors. It could find following problems,
 <ul>
 <li> No global found (e.g., using a module without importing it)
 <li> Passing the wrong number of parameters to functions/methods/constructors
 <li> Passing the wrong number of parameters to builtin functions & methods
 <li> Using format strings that don't match arguments
 <li> Using class methods and attributes that don't exist
 <li> Changing signature when overriding a method
 <li> Redefining a function/class/method in the same scope
 <li> Using a variable before setting it
 <li> self is not the first parameter defined for a method
 <li> Unused globals and locals (module or variable)
 <li> Unused function/method arguments (can ignore self)
 <li> No doc strings in modules, classes, functions, and methods
</ul>

PyChecker is a tool for finding bugs in python source code. It is similar to lint. PyChecker checks for each function, class and method for possible problems. It is capable to identify import errors.

PyChecker - finds bugs in Python

CodeNarc analyzes Groovy code for defects, bad practices, inconsistencies, style issues, coding standards, best practices and more. CodeNarc triggers violations based on rules which are predefined or custom rules. The static analysis report is generated in XML or HTML format. It is well integrated with the Ant Task and plugins exist for Maven, Gradle, Grails, Griffon, Sonar and Hudson.

CodeNarc - Static Analysis for Groovy

Jlint will check your Java code and find bugs, inconsistencies and synchronization problems by doing data flow analysis and building the lock graph.  Jlint is extremely fast. It is easy to learn and requires no changes to the class files. Jlint has been used in an industrial environment and successfully uncovered faults with little effort.

JLint - static analysis for Java

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FindBugs - Static Analysis Tool for Java

PMD - An extensible cross-language static code analyzer

Checkstyle - Checks Java coding standard

Error Prone - Catch common Java mistakes as compile-time errors

PyChecker - finds bugs in Python

CodeNarc - Static Analysis for Groovy

JLint - static analysis for Java

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FindBugs - Static Analysis Tool for Java

PMD - An extensible cross-language static code analyzer

Checkstyle - Checks Java coding standard

Error Prone - Catch common Java mistakes as compile-time errors

PyChecker - finds bugs in Python

CodeNarc - Static Analysis for Groovy

JLint - static analysis for Java

TechStack

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