Issue Management Tools

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Category	Project Planning (20) Issue ManagementXexclude from selection Project Collaboration (16)
License	Open Source (18) Commercial (17) Web-based service (SaaS) (16)
Programming language	Java (10) Perl (2) PHP (11) Python (3) Ruby (2) TCL (1)
Operating systems	AIX (4) FreeBSD (3) HP-UX (2) IBM i (1) LinuxXexclude from selection NetBSD (2) OS X (21) Solaris (7) Unix (6) Windows (25)
Mobile apps	Android (8) iOS (8) Windows Phone (1)
Authentication mechanism	Password (28) LDAP (22) OpenID (1) SAML (1) NTLM (2) RADIUS (1) Kerberos (1) CAS (1) IMAP (1) HTTP authentication (3) Active Directory (6) Amazon sign-on (1) Disqus sign-on (1) Facebook sign-on (1) GitHub sign-on (2) Google sign-on (3) Persona sign-on (1) Yahoo sign-on (1)
Notifications	Desktop push (1) Email (29) Instant messaging (1) RSS feeds (9)
Features	Web-based architecture (29) API (24) Multi-user (30) User roles (27) Hierarchical issues (11) Custom fields (26) Custom workflows (23)

30 project management systems with the selected characteristics.
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