Third party tools are seperate software projects that can greatly extend the operational abilities of Bazaar. This page provides a quick conceptual description of each tool. If a particular tool can be of use to you then see the 3rdPartyDownloads page. Another type of third party software specifically meant for Bzr usage are Bazaar Plugins.
Explorer - cross platform desktop application for Bazaar
SCM Multi-VCS front-end
Meld Mainly a merge/diff program, but also supports repository browsing,commit, update...
Push Me Pull You A GUI for distributed VCS systems, in development.
Diffuse is a graphical merge and comparison tool with Bazaar support.
bzr-gtk provides a graphical visualization of Bazaar branches and GTK+ interface for annotate.
QBzr provides a graphical interface for Bazaar using the QT+ toolkit.
Wildcat BZR cross-platform GUI based on wxPython.
BzrLog Take notes while you hack to improve commit messages.
TortoiseBzr - Integration in the Microsoft Windows graphical shell
NautilusIntegration - Integration in Nautilus, the GNOME graphical shell
SSMS - SQL Server Management Studio integration via Red Gate SQL Source Control
BzrEmacs - Provides Emacs integration with Bazaar
BzrEmacsConflicts - Provides conflict assistance under emacs.
vc-bzr (https://launchpad.net/vc-bzr) which is integrated in emacs22
Graphical diff tools - run graphical diff tools (including kdiff3, kompare, meld, and vimdiff) from bzr. See BzrPlugins (difftools or vimdiff) for details.
PIDA An IDE with Bazaar support - filebrowser statuses and basic file operations.
bzr4idea - Integration into IntelliJ IDEA
UnifiedSCC - Integration for Visual Studio
VisualStudioIntegration - Integration in Microsoft Visual Studio 2005 (discontinued)
GeditIntegration - Gedit plugin for Bazaar.
PatchQueueManager is a email based system to manage a multi-committer branch by following orders given by email.
ConfigManager gives developers the ability to split a tree into several branches. Multiple revision control systems are supported.
Integrated Bug Trackers
TracBzr integrates bug tracking, wiki functionality and branch management in one interface.
BugTool integrates sourceforge with a local RT instance
Bugs Everywhere A decentralized bug tracker
Ditz Another decentralized bug tracker, SCM-agnostic, written in Ruby
Web visualization tools