WebIssues is a multi-platform system for issue tracking and team collaboration. It can be used to store, share, and track issues with various attributes, description, comments, and file attachments. It is easy to install and use but has many capabilities and is highly customizable. Desktop and Web clients are provided.
XPTracker is a radical alternative agile planning tool aimed at keeping out of your way and making sure you can see the stuff you care about at a glance. Included in this tool is a very advanced search system based on Lucene, an easy-to-use planning system based on Queues, and a customizable reporting engine (with burndown/scope creep charts) called Timelines.
Yet Another Nopaste is an implementation of nopaste, allowing copy and paste of pieces of code from numerous languages for sharing using a simple URL, optionally protected with a password. It uses GeSHi as a highlighter back-end. It does not use a database. It is focussed on quick and simple usage.
YouTrack is a Web-based, keyboard-centric issue and bug tracker. Its lightning-fast bug reporting is complemented with powerful native language-like search queries and batch operations on multiple issues from the command window. All major functionality is accessible from anywhere via easy-to-learn shortcuts. You can create and manage custom attributes and adjust their visibility. Batch operations can also be performed programmatically with the REST API. Issues can be posted from any Web page via the 'Create Issue' bookmarklet.
Yoxel SW is an adaptive project management solution allowing you to maintain a continuous feedback loop with your customers while collaboratively planning and implementing development iterations. It includes a request/bug tracker, release manager, customer portal, and knowledge/Q&A/FAQ management system.
bib_errors can be used to intercept runtime errors of PHP scripts. It registers a PHP error handler function that outputs the details about the errors to a given log file. The errors can be displayed as part of the current script output or sent to a given email address to let the site administration or developer react promptly.
bug is a simple tracking system for console users. It only depends on common Unix commands. Its database format is a text file containing simple tabbed columns which can be even hand-edited. It uses $EDITOR for submitting or editing the issues and for changing states or priorities. It relies on four fixed fields: ID, Priority, State, and Subject. There is also a fifth free-text field for any other information you may want to store about the issue. There is no database locking or notifications, so it's mostly for tracking the user's own issues.