Free debuggers software for linux

Major Features:

1. JavaScript debugger for stepping through code one line at a time
2. Status bar icon shows you when there is an error in a web page
3. A console that shows errors from JavaScript and CSS
4. Log messages from JavaScript in your web page to the console (bye bye "alert debugging")
5. An JavaScript command line (no more "javascript:" in the URL bar)
6. Spy on XMLHttpRequest traffic
7. Inspect HTML source, computed style, events, layout and the DOM

Enhancements:

• Fixes for issue 1963, undefined objects in console and DOM panels,
• Issue 1968, on for all pages, but minimized,
• Issue 1970, Errors inside an XmlHttpRequest.onReadyStateChange fail silently,
• Fixed exceptions in Console and additional context-related problems around detached Firebug windows.

Requirements: Mozilla Firefox

EiffelStudio is the complete Eiffel development platform for Linux/Unix/Windows/Mac OS X.

EiffelStudio is a complete development environment for the Eiffel programming language. It includes a compiler, an interactive debugger, and many modern features like a full round-trip class diagram editor or refactoring support. Eiffel is compiled through C to produce very fast executables.

EiffelStudio is highly portable and supports Linux, Microsoft Windows, Mac OS X, most flavors of Unix, and even VMS or embedded environments. Portability of applications is supported by a large set of portable libraries, including: EiffelBase (data structure), EiffelNet (network), EiffelVision (native GUI), EiffelStore (database access), EiffelParse (parsing), Gobo (XML), EiffelWeb (Web), EiffelCOM (COM), and many more.

EDB (Evans Debugger) is a QT4 based binary mode debugger with the goal of having usability on par with OllyDbg.

EDB project uses a plugin architecture, so adding new features can be done with ease. The current release is for Linux, but future releases will target more platforms.

Devel::ptkdb is a Perl debugger using a Tk GUI.
ptkdb is a debugger for perl that uses perlTk for a user interface.
Main features:
- Hot Variable Inspection
- Breakpoint Control Panel
- Expression List
- Subroutine Tree
SYNOPSIS
To debug a script using ptkdb invoke perl like this:
perl -d:ptkdb myscript.pl
Usage
perl -d:ptkdb myscript.pl
Code Pane
Line Numbers
Line numbers are presented on the left side of the window.
Lines thathave lines through them are not breakable. Lines that are plain text are breakable. Clicking on these line numbers will insert a breakpoint on that line and change the line number color to $ENV{PTKDB_BRKPT_COLOR} (Defaults to Red). Clicking on the number again will remove the breakpoint. If you disable the breakpoint with the controls on the BrkPt notebook page the color will change to $ENV{PTKDB_DISABLEDBRKPT_COLOR}(Defaults to Green).
Cursor Motion
If you place the cursor over a variable (i.e. $myVar, @myVar, or %myVar) and pause for a second the debugger will evaluate the current value of the variable and pop a balloon up with the evaluated result. This feature is not available with Tk400.
If Data::Dumper(standard with perl5.00502)is available it will be used to format the result. If there is an active selection, the text of that selection will be evaluated.

Winpdb project is an advanced python debugger, with support for smart breakpoints, multiple threads, namespace modification, embedded debugging, encrypted communication and speed of up to 20 times that of pdb.
Well, actually rpdb2 is the advanced debugger and Winpdb is its GUI, and I am their author, and this is their home page. So, whenever I refer in this website to Winpdb, whatever I write about it applies to rpdb2 too, except for GUI stuff of course. They even use the same command line flags.
Main features:
- GPL License
- Compatible with CPython 2.3, 2.4
- Platform independent, and tested on Windows XP, Linux Fedora-Core 4, and Mac OSX Tiger
- User Interfaces: rpdb2 is console based, while winpdb requires wxPython 2.6
Enhancements:
New Features:
- Added support for os.fork().
- Automatically track threads created directly with thread.start_new_thread().
- When modifying a value in the name-space viewer, the current value is given if possible.
- On Windows, Winpdb installs a start group folder to improve usability.
Security:
- Session password is removed from data structures that are sent from the server to the client.
Interface Changes:
- Removed CSimpleSessionManager.script_about_to_terminate_callback().
- Added CSimpleSessionManager.script_paused().
- Added CSessionManager.set_fork_mode().
- Added CSessionManager.get_fork_mode().
- Added CEventPsycoWarning.
- Added CEventForkMode.
- Added NotPythonSource exception.
Other Changes:
- Bug fix of bug 1744719 - "Address already in use error in Solaris"
- Changed the semantics of the name-space filter to filter out __methods__ from objects and classes.
- Added a warning when the psyco module is detected.
- The debugger now starts the script inside the default shell (e.g. bash).
- Improved name-space performance with large data structures in response to forum post: "More Torture Testing" - http://sourceforge.net/forum/forum.php?thread_id=1786226&forum_id=485189
- Fixed regression where script name-space was released too early and was not available in analyze mode of unhandled exceptions.
- Fixed FindFile() to expand username in path.
- Fixed debugger not to pause on breakpoints after detach.
- Fixed debugger to handle links correctly.
- Miscellaneous bug fixes.

Eric is a full featured Python and Ruby editor and IDE, written in python. It is based on the cross platform Qt gui toolkit, integrating the highly flexible Scintilla editor control. The project is designed to be usable as everdays quick and dirty editor as well as being usable as a professional project management tool integrating many advanced features Python offers the professional coder.
Main features:
- Unlimited number of editors
- Configurable window layout
- Configurable syntax hilighting
- Sourcecode autocompletion
- Sourcecode calltips
- Sourcecode folding
- Brace matching
- Error highlighting
- Advanced search functionality including project wide search and replace
- Integrated class browser
- Makro recordings
- Integrated version control interface for Cvs and
- Subversion repositories
- Integrated sourcecode documentation system
- Integrated python debugger including support to debug multithreaded applications
- Integrated, full featured Ruby debugger
- Integrated profiling and code coverage support
- Integrated task (todo items) management
- Advanced project management facilities
- Interactive Python shell including syntax hilighting and autocompletion
- Interactive Ruby shell including syntax hilighting and autocompletion
- Integrated Bicycle Repair Man (refactoring tool)
- Application diagrams Running external applications from within the IDE
- integrated unittest support
- Cyclops cycles finder support
- Integrated CORBA support based on omniORB
- Integrated interface to cx_freeze
- Integrated interface to PyLint
- Many integrated wizzards for regex and Qt dialogs
- Localizations. Currently Eric is available in English, German, French, Russian and Czech.
- ...many, many more not mentioned here
Enhancements:
- bug fixes

pebugger is an interactive command-line based debugger for PHP, written in PHP. The project vaguely resembles gdb. Its basicaly a dbgp client.

This is currently in an early development stage. Its stable and usable, but not fully featured, yet. Its something I am keen to start using myself, so features should be added fairly quickly.

So far, you can set breakpoints, step through code, and query variables.

Java Tools is a lightweight integrated development environment for creating, compiling, and executing Java applications and applets.
Java Tools includes point and click access to the Java files, commands, and documents. It also includes a built-in text editor and user interface for the Java debugger.
It is intended for the new Java user who needs help getting started. Its also for the more experienced Java user who wants easy access to the Java commands and a text editor.
Main features:
- GUI with built-in help and small footprint.
- Point and click access to all files (Java, manifest, HTML, image and sound) and directories (package).
- Point and click access to all commands for compiling (javac), archiving (jar), documenting (javadoc), executing (java), debugging (jdb) and disassembling (javap).
- Point and click access to all documents (Java API Specification, Java Tools and Utilities, Java Features and Java Tutorial).
- Point and click creation of all files (Java, manifest and HTML) and directories (package).
- Point and click installation of distribution archive files (Java document, Java source code, Java Tutorial and Sun Tools).
- Automatic determination of class file dependencies for archiving (jar) and documenting (javadoc) Java files.
- Checking for unused, redundant and missing imports.
- Logging of all commands invoked by GUI.
- Code metrics for Java files.
- Built-in text editor (see Edit for details).
- Built-in user interface for the Java debugger with command-line editing and history.
- Self-installing executable (Java archive file).
- Comprehensive installation and user documentation for Java and Java Tools.