MyTracker is open tracking and collaboration system. It is intended not only for bug-tracking. You can install it as a desktop solution, as a client-server solution and over web services can you access it world-wide. It support firebird/IB database.
BugReporter is a bugtracking system wich allows development teams keep the track to bugs and issues on released products as well as its correction. It works on MS.NET with SQL Server 2000. Posts are done via web or via web service.
Deploy in 115+ regions with the modern database for every enterprise.
MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
BugTracking system in ASP.NET - not everyone has a PHP hosting environment to keep track of bugs ;-)
WShield supports multiple projects, modules & versions like just about any other bugtracking system.