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Bosco Bosco is a rewrite of the popular Bugzilla defect tracking software in PHP. It is database-independent, and aims to be easy to maintain and modify. It also has an API to allow external applications to work with its data.

Bug-A-Boo 'Bug-A-Boo' is a bug reporting and tracking system that runs on any Web server that supports CGI. It can handle any number of projects, users, and bug classifications, and is really flexible in their setup. It features fast fulltext search, query storage, themes, and bug watches. It uses the tdbengine as a database backend.

Bugdar Bugdar is a bug tracking system that is meant to replace other solutions that are slow and cumbersome. It features a completely comprehensive permissions and usergroups system that allows for extremely flexible control over what users can access. To ensure that your server never lags, portions of Bugdar's data is cached to both reduce load and increase speed. If you want to change any aspect of Bugdar's appearance, all you have to do is edit the semantic XHTML templates or one of the CSS definitions that control the entirety of Bugdar. One of the unique features in Bugdar is the "automations" system. This allows administrators to define a macro that will change any field in a bug and then add a comment with the click of a button. This makes marking a bug closed, fixed, and leaving a comment when a bug is done very easy. Other features include: custom fields, email notifications, Atom syndication, historical logging, "favorite" bugs, voting, and internationalization support.

Bugtrack Bugtrack is a Web-based bug tracking system written in Perl. It supports multiple users and projects with multiple components and versions, provides e-mail notification, and should work with any DBI compliant database. The program was designed to be more prtable and have a simpler interface than programs like bugzilla or jitterbug. It should also have an easy setup, since there are only 6 required files.

Bugzilla Bugzilla is the leading open-source/free software bug tracking system. It features a comprehensive set of fields, attachment management, inter-bug dependencies, email notification of changes, a powerful query interface, reporting, and Web, XML, email, and console interfaces. It can be managed entirely using a Web-based UI. The user UI is customizable using templates.

Calltree 'calltree' is a static call tree generator for C programs. It parses a collection of input files and builds a graph that represents the static call structure of the files.

Carp-Clan 'Carp::Clan' reports errors from the perspective of the caller of a "clan" of modules, similar to "Carp.pm" itself. But instead of giving it a number of levels to skip on the calling stack, you give it a pattern to characterize the package names of the "clan" of modules which will never be blamed for any error. So these modules stick together like a "clan"; any error will be blamed on the "outsider" script or modules not belonging to the "clan".

Double Choco Latte Double Choco Latte is a system for tracking bugs, changes and enhancements to software, and requests for software. It is suitable for multiple products and multiple accounts (clients). It is also known to handle call center activity, although this will evolve into a separate module. It is part of the GNU Enterprise project that provides basic project management capabilities, time tracking on tasks, call tracking, email notifications, online documents, statistical reports, a report engine, with other features either working or in development. It can be used inside of a phpGroupWare installation or as a stand-alone.

EnterTrack 'EnterTrack' is a web-based artifact tracking and management system. It provides large organizations with complete tracking of artifacts (artifacts can be problems, bugs, requests, projects, etc.), group collaboration for artifact management, and status reports for high-level performance metrics.

Eventum Eventum is a user-friendly and flexible issue tracking system that can be used by a support department to track incoming technical support requests, or by a software development team to quickly organize tasks and bugs.

Flyspray Originally developed for the Psi project, Flyspray is an easy to use bug tracking system for those who don't require all the complexities of something like Bugzilla. It supports multiple users, file attachments, and Jabber notifications.

Gnats GNATS organizes the large volume of email that flows between end users and software maintainers by defining a database made up of archived and indexed email messages. It consists of several utilities which, when used together, formulate and administer a database of Problem Reports grouped by site-defined "problem categories." It lets a support organization track problems in an organized manner through acting as an active field archive for field-separated textual data submitted through email. There are several front end interfaces, including command line, Emacs, and TCL/Tk. There are also a number of Web interfaces (CGI) written in languages like Python and Perl.

Gnatsweb Gnatsweb allows you Web access to GNATS bug management system database through the gnatsd interface. You do not have to run it on the same machine where GNATS resides.

Gwyple 'gwyple' is a GUI, implemented in Perl and Perl/Tk, for handling bug reports. These reports usually arrive by email, are stored by helper scripts called from procmail, and can then be organized by gwyple independently from the used BTS.

JitterBug JitterBug is a Web-based bug tracking tool originally written to manage the huge volume of bug reports and queries the Samba Team receives. It is now used by a number of other projects. The program is available in English and French. JitterBug receives bug reports via email or a web form. Authenticated users can then reply to the message, move it between different categories or add notes to it. Users can add arbitrary notes to each message, and an audit trail is kept for each message showing who did what. Users can request email notification of changes to files or directories. JitterBug is like a communal web based email system; the whole system is a single C program running as a CGI script and fully HTML 3.2 compliant. The program uses your server's built-in authentication, and has a built in SMTP mail client for sending replies and notifications.

LibSysCtr LibSysCTr intercepts system call functions on a GNU/Linux system. Process monitoring and sandboxing are just two of its potential uses. LibSysCTr uses the ptrace(2) functionalities by monitoring and reporting events to the library caller. LibSysCTr is callback driven, which means the user initializes the library with systr_init_library(), registers the system calls he wants to monitor with systr_trace_syscall(), and calls systr_run() to start receiving events in the form of callback invocation. For each intercepted system call, two calls to the registered callback function are performed: one during the system call entry, before the system call iteself will be executed by the kernel, and one after the kernel has processed the system call (right before returning the userspace). Utility functions are supplied to, retrieve information about the process, get/set the system call parameters, and read/write the monitored process address space.

Mantis Mantis is a PHP/MySQL-based bugtracking system. It is extremely easy to deploy and customize, and features one of the simplest and cleanest interfaces of any tracking tool available. It supports multiple projects and email notification, and is localized for over 18 languages.

Open Ticket Request System OpenTRS is a free and open source Ticket Request System with email and phone interfaces and many other features to manage customer telephone calls and e-mails.

PRepS PRepS is a problem reporting and tracking system similar to Gnats, only simpler to use. Currently, PRepS is best used with smaller projects or projects where all developers have access to the same network. For more "remote" projects, Gnats may be a better choice. It was designed for tracking pproblems with software, but can also be used for tracking other kinds of problems or tasks.

PgRequestTrackerReport pg Request Tracker 2/3 Report is a set of tools for generating reports for Request Tracker 2/3 (RT 2/3). Currently, it only supports the Postgres ("pg") and MySQL backends.