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Easy to Install (both internally and in hosted environments).
Easy to evaluate
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InstantMantis - Be up and running in 2 minutes (not recommended for production use)
Simple User Experience
Web Based
Supports any platform that runs
PHP (Windows, Linux, Mac, Solaris, AS400/i5, etc)
Available in 68 localizations.
Simple/Advanced Issue Pages
Multiple Projects per instance
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Users can have a different access level per project
Changelog Support
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My View Page
Search and Filter
Built-in Reporting (reports / graphs)
Custom Fields
Email notifications
Users can monitor specific issues
Attachments (can be saved on webserver or in database - can also backup to an
FTP account)
Issue Change History
RSS Feeds (news, issues matching saved filters, issues matching a specific project)
Customizable issue workflow
Sponsorships Support - users are able to place bounties or sponsorships for specific issues, also developers can track such sponsorships / payments.
Anonymous Access
Signup with Captcha and Email Confirmation.
Self-Service Reset Password Support
Export to csv, Microsoft Excel, Microsoft Word
Ability to extended functionality through hook (custom) functions.
Reporting issues via Email (available as a patch - currently being integrated)
Reporting Issues via a custom form on your website (
Anonymantis).
Source Control Integration (SVN and
CVS).
No limit on the number of users, issues, or projects.
Wiki Integration (optional)
Time Tracking
Ability to send messages to messages to other users in regards to a specific issue.
Public / Private Projects - Public project accessible to all users, private are only accessible to those explicitly added.
Public / Private Notes - Private notes are accessible to users with a specific access level to the relevant project.
Public / Private Issues - Private issues are accessible to users with a specific access level to the relevant project.
Issue Relationships
Issue Relationship Graphs (uses “dot” library).
Attachment Auto-Preview
Public / Private News (news can be associated with a specific project, or with all projects).
Sticky Issues (always appear on the top of the issues list).
Group Actions: actions can be applied on multiple issues.
Easy hyperlinks to issues and issue notes (e.g. #123 hyper links to issue number 123).
Ability to view recently visited issues (the last 5 visited issues are visible by default at the top right corner).
Authentication
Chat Integration (optional)
Multi-DBMS Support - Mantis uses ADODB as an abstraction library to support multiple DBMSes.
MySQL
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PostgreSQL
Oracle (experimental)
DB2 (in progress)
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A
SOAP web service that is implemented in
PHP and can be consumed from any language that supports
SOAP web services.
.NET Client Library
Java Client Library
Cocoa Client Library
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Online Chat (optional integration)
There are community projects that integrate it with content management and project management too

Twitter Integration allowing users to monitor updates (Added in release 1.1.0a4)